A Hipparcos census of the nearby OB associations

Abstract

A comprehensive census of the stellar content of the nearby OB associations is presented, based on Hipparcos positions, proper motions, and parallaxes. Moving groups are identified by combining de Bruijne's refurbished convergent point method with the `Spaghetti method' of Hoogerwerf & Aguilar. Monte Carlo simulations are used to estimate the expected number of interloper field stars. Astrometric members are listed for 12 young stellar groups, out to a distance of ~650 pc. These are the 3 subgroups Upper Scorpius, Upper Centaurus Lupus and Lower Centaurus Crux of Sco OB2, as well as Vel OB2, Tr 10, Col 121, Per OB2, alpha Persei (Per OB3), Cas-Tau, Lac OB1, Cep OB2, and a new group designated as Cep OB6. The selection procedure corrects the list of previously known astrometric and photometric B- and A-type members, and identifies many new members, including a significant number of F stars, as well as evolved stars, e.g., the Wolf-Rayet stars gamma^2 Vel (Vel OB2) and EZ CMa (Col 121), and the classical Cepheid delta Cep in Cep OB6. In the nearest associations the later-type members include T Tauri objects and other pre-main sequence stars. Astrometric evidence for moving groups in the fields of R CrA, CMa OB1, Mon OB1, Ori OB1, Cam OB1, Cep OB3, Cep OB4, Cyg OB4, Cyg OB7, and Sct OB2, is inconclusive, due to their large distance or unfavorable kinematics. The mean distances of the well-established groups are systematically smaller than previous estimates. The mean motions display a systematic pattern, which is discussed in relation to the Gould Belt. Six of the 12 detected moving groups do not appear in the classical list of nearby OB associations. The number of unbound young stellar groups in the Solar neighbourhood may be significantly larger than thought previously.

51 pages, 30 PostScript figures, 6 tables in PostScript format, default LaTeX using psfig.sty; accepted for publication in the Astronomical Journal, scheduled for January 1999 issue. Abbreviated abstract

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• Discovery of Reflection Nebulosity Around Five Vega-like Stars
• On the absence of wind bow-shocks around OB-runaway stars: probing the physical conditions of the interstellar medium
• Stellar disk destruction by dynamical interactions in the Orion Trapezium star cluster
• Reconsidering the Effects of Local Star Formation On Type Ia Supernova Cosmology
• A radio-polarisation and rotation measure study of the Gum Nebula and its environment
• The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member
• Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: IV Upper Sco
• Orbital and physical properties of the $\sigma$ Ori Aa,Ab,B triple system
• A precise asteroseismic age and metallicity for HD 139614: a pre-main-sequence star with a protoplanetary disc in Upper-Centaurus Lupus
• The Distance to the Isolated Neutron Star RX J0720.4-3125
• Lupus DANCe. Census of stars and 6D structure with Gaia-DR2 data
• On the common origin of the AB Dor moving group and the Pleiades cluster
• Observational Tests and Predictive Stellar Evolution
• A Search for Mid-Infrared Molecular Hydrogen Emission from Protoplanetary Disks
• Disks and Outflows in CO Rovibrational Emission from Embedded, Low-Mass Young Stellar Objects
• The Magnetic Early B-type Stars IV: Breakout or Leakage? H$\alpha$ emission as a diagnostic of plasma transport in centrifugal magnetospheres
• The origin of RXJ1856.5-3754 and RXJ0720.4-3125 -- updated using new parallax measurements
• A Census of the Taurus Star-forming Region and Neighboring Associations with Gaia
• Dynamical Masses of Young Stars I: Discordant Model Ages of Upper Scorpius
• A Pan-STARRS + UKIDSS Search for Young, Wide Planetary-Mass Companions in Upper Scorpius
• ACRONYM III: Radial Velocities for 336 Candidate Young Low-Mass Stars in the Solar Neighborhood, Including 78 Newly Confirmed Young Moving Group Members
• An Infrared Nebula Associated with Delta Cephei: Evidence of Mass Loss?
• HD 169142 in the eyes of ZIMPOL/SPHERE
• Angular Momentum in Giant Molecular Clouds. I. The Milky Way
• The JCMT Legacy Survey of the Gould Belt: mapping 13CO and C18O in Orion A
• Gamma-ray line emission from OB associations and young open clusters. II. The Cygnus region
• Disc Frequencies for Brown Dwarfs in the Upper Scorpius OB Association: Implications for Brown Dwarf Formation Theories
• A ring in a shell: the large-scale 6D structure of the Vela OB2 complex
• A large moving group within the Lower Centaurus Crux association
• Flared Disks and Silicate Emission in Young Brown Dwarfs
• Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk
• On the mass accretion rate and infrared excess in Herbig Ae/Be Stars
• The optical+infrared L dwarf spectral sequence of young planetary-mass objects in the Upper Scorpius association
• Copious Amounts of Hot and Cold Dust Orbiting the Main Sequence A-type Stars HD 131488 and HD 121191
• An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2
• Identification of Moving Groups and Member Selection using Hipparcos Data
• Dynamical parallax of sigma Ori AB: mass, distance and age
• 51 Eri and GJ 3305: A 10-15 Myr old binary star system at 30 parsecs
• New members in the Upper Sco association from the UKIDSS Early Data Release
• A nearby recent supernova that ejected the runaway star zeta Oph, the pulsar PSRB1706-16, and 60-Fe found on Earth
• A kinematic study and membership analysis of the Lupus star-forming region
• Variability and dust filtration in the transition disk J160421.7-213028 observed in optical scattered light
• A CO survey in planet-forming disks: characterizing the gas content in the epoch of planet formation
• Optical-uv spectrum and proper motion of the middle-aged pulsar b1055-52
• A resolved debris disk around the candidate planet-hosting star HD95086
• Grain growth across protoplanetary discs: 10-micron silicate feature versus millimetre slope
• A wide-orbit giant planet in the high-mass b Centauri binary system
• The Gaia Ultra-Cool Dwarf Sample -- II: Structure at the end of the main sequence
• Characterization of Low-mass, Wide-separation Substellar Companions to Stars in Upper Scorpius: Near-infrared Photometry and Spectroscopy
• JCMT POL-2 and BISTRO Survey observations of magnetic fields in the L1689 molecular cloud
• The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems
• Multi-Generational Star Formation in L1551
• Testing the universality of star formation - II. Comparing separation distributions of nearby star-forming regions and the field
• Deuterated molecular hydrogen in the Galactic ISM. New observations along seven translucent sightlines
• The Gaia-ESO Survey: Discovery of a spatially extended low-mass population in the Vela OB2 association
• The characteristics of the IR emission features in the spectra of Herbig Ae stars: Evidence for chemical evolution
• Three-Dimensional Distribution of the Interstellar Dust in the Milky Way
• The Origin of the Stellar Mass Distribution and Multiplicity
• A Correlation Between Circumstellar Disks and Rotation in the Upper Scorpius OB Association
• BAFFLES: Bayesian Ages for Field Lower-Mass Stars
• A submillimetre survey of the kinematics of the Perseus molecular cloud: I. data
• A census of $\rho$ Oph candidate members from Gaia DR2
• The Palomar Transient Factory Orion Project: Eclipsing Binaries and Young Stellar Objects
• Terminal velocities of luminous, early-type SMC stars
• First scattered-light images of the gas-rich debris disk around 49 Ceti
• Rotation and Lithium Confirmation of a 500 Parsec Halo for the Open Cluster NGC 2516
• Tomographic Separation of Composite Spectra. VIII. The Physical Properties of the Massive Compact Binary in the Triple Star System HD 36486 (delta Orionis A)
• Exocomets: A spectroscopic survey
• The proper motion of the isolated neutron star RX J1605.3+3249
• Proper motions of thermally emitting isolated neutron stars measured with Chandra
• Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey
• The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure
• Constraints on the Polarization of the Anomalous Microwave Emission in the Perseus Molecular Complex from 7-year WMAP data
• Stellar Properties of Pre-Main Sequence Stars from High Resolution Near-IR Spectra
• Constraints on the Circumstellar Disk Masses in the IC 348 Cluster
• 3D Stellar Reddening Map from 2MASS Photometry: An Improved Version
• New Brown Dwarf Companions to Young Stars in Scorpius-Centaurus
• Fundamental Properties of the Highly Ionized Plasmas in the Milky Way
• Discovery of a directly imaged planet to the young solar analog YSES 2
• On the origin of the wide-orbit circumbinary giant planet HD 106906: A dynamical scenario and its impact on the disk
• A Young Planetary-Mass Object in the rho Oph Cloud Core
• Spectroscopy and Time Variability of Absorption Lines in the Direction of the Vela Supernova Remnant
• Chandra spectroscopy of the hot star beta Crucis and the discovery of a pre-main-sequence companion
• 3D magnetic field morphology of the Perseus molecular cloud
• Belt(s) of debris resolved around the Sco-Cen star HIP 67497
• The Gaia-ESO Survey: metallicity of the Chamaeleon I star forming region
• The dust-scattered X-ray halo around Swift GRB 050724
• The COMPLETE Nature of the Warm Dust Ring in Perseus
• 2MASS 22344161+4041387AB: A Wide, Young, Accreting, Low-mass Binary in the LkHa233 Group
• Low mass young stars in the Milky Way unveiled by DBSCAN and Gaia EDR3. Mapping the star forming regions within 1.5 Kpc
• A new paradigm for the X-ray emission of O stars from XMM-Newton observations of the O9.7 supergiant zeta Orionis
• A stellar relic filament in the Orion star forming region
• The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs
• Further Evidence of the Planetary Nature of HD 95086 b from Gemini/NICI H-band Data
• A Multiplicity Census of Intermediate-Mass Stars in Scorpius-Centaurus
• The low-mass companion of GQ Lup
• Absolute dimensions of the unevolved B-type eclipsing binary GG Orionis
• A revised estimate of the distance to the clouds in the Chamaeleon complex using the Tycho-Gaia Astrometric Solution
• Constraining the Earliest Circumstellar Disks and their Envelopes
• Evidence that the Directly-Imaged Planet HD 131399 Ab is a Background Star
• New constraints on the membership of the T dwarf S Ori 70 in the sigma Orionis cluster
• Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
• A Census of the Circumstellar Disk Populations in the Sco-Cen Complex
• Variability of the NGC 1333 IRAS 4A Outflow: Molecular Hydrogen and Silicon Monoxide Images
• Strongly induced collapse in the Class 0 protostar NGC 1333 IRAS 4A
• Collective outflow from a small multiple stellar system
• The Peculiar Debris Disk of HD 111520 as Resolved by the Gemini Planet Imager
• The HI Probability Distribution Function and the Atomic-to-Molecular Transition in Molecular Clouds
• Revisiting the birth locations of pulsars B1929+10, B2020+28,and B2021+51
• New Herbig Ae/Be stars confirmed via high-resolution optical spectroscopy
• Orbital motion in T Tauri binary systems
• A Spectroscopic Study of Field and Runaway OB Stars
• Young stars and brown dwarfs surrounding Alnilam (eps Ori) and Mintaka (del Ori)
• The $\mu$ Tau Association: A 60 Myr-Old Coeval Group at 150 pc from the Sun
• SMC-Type Interstellar Dust in the Milky Way
• Additional TWA Members? : Spectroscopic verification of kinematically selected TWA candidates
• The initial period function of late-type binary stars and its variation
• Star-disc (mis-)alignment in Rho Oph and Upper Sco: insights from spatially resolved disc systems with K2 rotation periods
• Triggered Star Formation on the Border of the Orion-Eridanus Superbubble
• On the infant weight loss of low- to intermediate-mass star clusters
• A brown dwarf desert for intermediate mass stars in Sco OB2?
• Discovery of an Edge-on Debris Disk with a Dust Ring and an Outer Disk Wing-tilt Asymmetry
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. IV. Lupus Observed with MIPS
• Discovery of a Transiting Adolescent Sub-Neptune Exoplanet with K2
• Unveiling the star formation history of the Upper Scorpius association through its kinematics
• Hundreds of new cluster candidates in the VISTA variables in the Via Lactea survey DR1
• OB Stars in the Solar Neighborhood I: Analysis of their Spatial Distribution
• Evolution of the T Tauri star population in the Lupus association
• Sequentially Triggered Star Formation in OB Associations
• TESS Hunt for Young and Maturing Exoplanets (THYME) IX: a 27 Myr extended population of Lower-Centaurus Crux with a transiting two-planet system
• Fundamental Properties of Co-Moving Stars observed by $Gaia$
• A Thermal Infrared Imaging Study of Very Low-Mass, Wide Separation Brown Dwarf Companions to Upper Scorpius Stars: Constraining Circumstellar Environments
• Triggered star formation and Young Stellar Population in Bright-Rimmed Cloud SFO 38
• M Dwarf rotation from the $K2$ young clusters to the field. I. A Mass-Rotation Correlation at 10 Myr
• Discovery of a brown dwarf companion to the star HIP 64892
• The Secret Lives of Cepheids: Evolutionary Changes and Pulsation-Induced Shock Heating in the Prototype Classical Cepheid δ Cep
• Gas shells and magnetic fields in the Orion-Eridanus superbubble
• Direct imaging and spectroscopy of exoplanets with the ELT/HARMONI high-contrast module
• Substellar Objects in Nearby Young Clusters VII: The substellar mass function revisited
• Isolated OB Associations in Stripped HI Gas Clouds
• B- and A-Type Stars in the Taurus-Auriga Star Forming Region
• Orbital Solution & Fundamental Parameters of sigma Scorpii
• OB Stars in the Solar Neighborhood II: Kinematics
• Radial and rotational velocities of young brown dwarfs and very low-mass stars in the Upper Scorpius OB association and the rho Ophiuchi cloud core
• Undetected Binary Stars Cause an Observed Mass Dependent Age Gradient in Upper Scorpius
• A search for circularly polarised emission from young exoplanets
• Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars
• The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098
• On the origin of the ultramassive white dwarf GD50
• The Projected Rotational Velocity Distribution of a Sample of OB stars from a Calibration based on Synthetic He I lines
• Catalogue of far-infrared loops in the Galaxy
• A Herschel view of protoplanetary disks in the $\sigma$ Ori cluster
• Inner disk clearing around the Herbig Ae star HD\,139614: Evidence for a planet-induced gap ?
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. III. Young L Dwarf Discoveries and Proper Motion Catalogs in Taurus and Scorpius-Centaurus
• The birthplace and age of the isolated neutron star RX J1856.5-3754
• HD144548: A young triply eclipsing system in the Upper Scorpius OB association
• Searching for unknown open clusters in the Tycho-2 catalog
• Observations of Global and Local Infall in NGC 1333
• SPOTS: The Search for Planets Orbiting Two Stars. III. Complete Sample and Statistical Analysis
• Discovery of new stellar groups in the Orion complex
• A Gaia Survey for Young Stars Associated with the Lupus Clouds
• A new sample of warm extreme debris disks from the ALLWISE catalog
• New Coronae and Stellar Associations Revealed by a Clustering Analysis of the Solar Neighborhood
• Hierarchical Star Formation: Stars and Stellar Clusters in the Gould Belt
• Near Infrared Spectroscopy of Young Brown Dwarfs in Upper Scorpius
• Observations of Herbig Ae Disks with Nulling Interferometry
• AKARI/IRC 18 Micron Survey of Warm Debris Disks
• The Frequency Of Binary Star Interlopers Amongst Transitional Discs
• Asteroseismic properties of solar-type stars observed with the NASA K2 mission: results from Campaigns 1-3 and prospects for future observations
• The spiral structure in the Solar neighborhood
• A Herschel PACS survey of the dust and gas in Upper Scorpius disks
• Results from The COPAINS Pilot Survey: four new brown dwarfs and a high companion detection rate for accelerating stars
• The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5
• Three-dimensional structure of the Upper Scorpius association with the Gaia first data release
• Disruption of Hierarchical Clustering in the Vela OB2 Complex and the Cluster Pair Collinder 135 and UBC7 with Gaia EDR3: Evidence of Supernova Quenching
• Magnetic fields in cometary globules - IV. LBN 437
• Chemical composition of Galactic OB stars I. CNO abundances in O9 stars
• Proper Motion and Timing of Two Unusual Pulsars: Calvera and 1E 1207.4-5209
• CO in Protostars (COPS): $Herschel$-SPIRE Spectroscopy of Embedded Protostars
• Discovery of a parsec-scale bipolar nebula around MWC 349A
• The X-ray sources at the center of the supernova remnant RXJ0852.0-4622
• Time-Resolved AU-Scale Jets Traced by Masers in the IRAS 4A/B Regions of NGC1333
• BEAST begins: Sample characteristics and survey performance of the B-star Exoplanet Abundance Study
• HD 95881: A gas rich to gas poor transition disk?
• Chandra and ASCA Observations of the X-ray-brightest T-Tauri Stars in the Rho Ophiuchi Cloud
• The Evolution of Circumstellar Disks in Ophiuchus Binaries
• Far-infrared loops in the 2nd Galactic Quadrant
• Late B-type stars and their candidate companions resolved with Chandra
• The First Scattered Light Image of the Debris Disk around the Sco-Cen target HD 129590
• Age spreads and the temperature dependence of age estimates in Upper Sco
• Lack of other molecules in CO-rich debris discs: is it primordial or secondary gas?
• A young binary Brown Dwarf in the R-CrA star formation region
• Density Variations over Subparsec Scales in Diffuse Molecular Gas
• HST/NICMOS Observations of NGC 1333: The Ratio of Stars to Sub-Stellar Objects
• The needle in the haystack - Where to look for more isolated cooling neutron stars
• Characterization of low-mass companion HD 142527 B
• Multi-wavelength observations of a nearby multi-phase interstellar cloud
• A multisite photometric campaign on the Pre-Main-Sequence delta Scuti pulsator IP Per
• The Spitzer Survey of Interstellar Clouds in the Gould Belt. V. Ophiuchus North Observed with IRAC and MIPS
• The rotating molecular core and precessing outflow of the young stellar object Barnard 1c
• The formation and early evolution of embedded star clusters in spiral galaxies
• Discovery of New Dipper Stars with K2: A Window into the Inner Disk Region of T Tauri Stars
• Testing the companion hypothesis for the origin of the X-ray emission from intermediate-mass main-sequence stars
• The Age of the Carina Young Association and Potential Membership of HD 95086
• A new take on the low-mass brown dwarf companions on wide-orbits in Upper-Scorpius
• Rotation of Low-Mass Stars in Upper Centaurus Lupus and Lower Centaurus Crux with TESS
• A new compact young moving group around V1062 Sco
• A Luminous Infrared Companion in the Young Triple System WL 20
• Photometric studies of three multiperiodic Beta Cephei stars: Beta CMa, 15 CMa and KZ Mus
• PSR J0357+3205: a fast moving pulsar with a very unusual X-ray trail
• Molecular cloud distances based on the MWISP CO survey and Gaia DR2
• Exploring the RCrA environment with SPHERE: Discovery of a new stellar companion
• Cosmic rays from supernova remnants and superbubbles
• Mapping young stellar populations towards Orion with Gaia DR1
• The Galactic Magnetic Field's Effect in Star-Forming Region
• Herschel-PACS observations of far-IR lines in YSOs I: [OI] and H2O at 63 microns
• Deuterium Fractionation in the Ophiuchus Molecular Cloud
• Searching for Planets in Holey Debris Disks with the Apodizing Phase Plate
• Are isolated planetary-mass objects really isolated? A brown dwarf-exoplanet system candidate in the sigma Orionis cluster
• The orbit of the close spectroscopic binary epsilon Lupi and the intrinsic variability of its early B-type components
• Gaia EDR3 distances of the young stellar clusters in the extended Carina Nebula complex
• The kinematic signature of the Galactic warp in Gaia DR1 - I. The Hipparcos subsample
• An eclipsing double-line spectroscopic binary at the stellar/substellar boundary in the Upper Scorpius OB association
• Probing the Upper Scorpius mass function in the planetary-mass regime
• The JCMT Spectral Legacy Survey
• Orbital elements, masses and distance of lambda Scorpii A and B determined with the Sydney University Stellar Interferometer and high resolution spectroscopy
• Wide-Field Survey of Emission-line Stars in IC 1396
• New brown dwarfs in the south part of the Upper Scorpius Association
• Low-luminosity X-ray sources and the Galactic ridge X-ray emission
• Periodic Pattern in the Residual-Velocity Field of OB Associations
• A scaled-up planetary system around a supernova progenitor
• Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
• A revisit to agglomerates of early-type Hipparcos stars
• A new free-floating planet in the Upper Scorpius association
• Discovery of a young stellar "snake" with two dissolving cores in the solar neighborhood
• GQ Lup and its common proper motion companion
• On the local birth place of Geminga
• Radiative transfer of ionizing radiation through gas and dust: stellar source case
• Brown Dwarf Disks at Ages of 5-10 Myr
• Magnetic Field Strengths and Grain Alignment Variations in the Local Bubble Wall
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• Dark impact and galactic star formation: Origin of the Gould belt
• New members of the TW Hydrae Association and two accreting M-dwarfs in Scorpius-Centaurus
• Proper motion survey and kinematic analysis of the Rho Ophiuchi embedded cluster
• Open clusters and associations in the Gaia era
• A catalog of early-type Hα emission line stars and 58 newly confirmed Herbig Ae/Bes from LAMOST DR7
• A debris disk under the influence of a wide planetary mass companion: The system of HD106906
• Chronostar. II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association
• The Origin of Cosmic Rays: How Their Composition Defines Their Sources and Sites, and the Processes of Their Mixing, Injection and Acceleration
• The ages of L dwarfs
• A Transient Transit Signature Associated with the Young Star RIK-210
• A WISE Census of Young Stellar Objects in Perseus OB2 Association
• Distances to Galactic OB-stars: Photometry vs. Parallax
• An ATCA survey of debris disks at 7 millimeters
• A bimodal dust grain distribution in the IC 434 HII region
• BD+43 3654 -- a blue straggler?
• USco1606-1935: An Unusually Wide Low-Mass Triple System?
• Radial velocity measurements of B stars in the Scorpius-Centaurus association
• The Little Dippers: Transits of Star-grazing Exocomets?
• An Infrared Census of Star Formation in the Horsehead Nebula
• The accelerating rotation of the magnetic He-weak star HD 142990
• New Evidence Supporting Cluster Membership for the Keystone Calibrator Delta Cephei
• The Corona Australis star formation complex is accelerating away from the Galactic plane
• Gas and Dust Toward DG Tau B and VV CrA
• Separated at Birth: The origin of the pulsars B2020+28 and B2021+51 in the Cygnus Superbubble
• Low Mass Stars as Tracers of Star and Cluster Formation
• Substructure, supernovae, and a time-resolved star formation history for Upper Scorpius
• Most nearby young star clusters formed in three massive complexes
• SPYGLASS. II. The Multi-Generational and Multi-Origin Star Formation History of Cepheus Far North
• Orbital Motion of Young Binaries in Ophiuchus and Upper Centaurus-Lupus
• Measuring proper motions of isolated neutron stars with Chandra
• The dynamics of the γ Vel cluster and nearby Vela OB2 association
• Ammonia Imaging of the Disks in the NGC 1333 IRAS 4A Protobinary System
• Astronomical Evidence for the Rapid Growth of Millimeter Sized Particles in Protoplanetary Disks
• A formation scenario of young stellar groups in the region of the Scorpio Centaurus OB association
• Spectral library of age-benchmark low-mass stars and brown dwarfs
• Detection of 6.7 GHz methanol absorption towards hot corinos
• Discovery of Resolved Debris Disk Around HD 131835
• Discovery of a Wide Low-mass Binary System in Upper Scorpius
• Testing the fragmentation limit in the Upper Sco association
• Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
• The Local Bubble and Interstellar Material Near the Sun
• First Resolved Scattered-Light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
• The 2011 Periastron Passage of the Be Binary delta Scorpii
• Identification of Young Stellar Variables with KELT for K2 II: The Upper Scorpius Association
• Deep ALMA Search for CO Gas in the HD 95086 Debris Disc
• Outflows in rho Ophiuchi as Seen with the Spitzer Infrared Array Camera
• New binaries from the SHINE survey
• Very Low-Mass Stars and Brown Dwarfs in Upper Scorpius using Gaia DR1: Mass Function, Disks and Kinematics
• Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association
• Squeezed between shells? On the origin of the Lupus I molecular cloud. APEX/LABOCA, Herschel, and Planck observations
• Kepler observations of A-F pre-main sequence stars in Upper Scorpius: Discovery of six new $\delta$~Scuti and one $\gamma$~Doradus stars
• A 3D View of Orion: I. Barnard's Loop
• MADYS: the Manifold Age Determination for Young Stars
• An Extremely Young Massive Stellar Object near IRAS 07029-1215
• The nearby, young, isolated, dusty star HD 166191
• On the Nature of Collinder 121: Insights from the Low-Mass Pre-Main Sequence
• Large Adaptive Optics Survey for Substellar Objects (LASSO) Around Young, Nearby, Low-mass Stars with Robo-AO
• Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments
• A Population of Dipper Stars from the Transiting Exoplanet Survey Satellite Mission
• The Nature of the Gould Belt from a Fractal Analysis of its Stellar Population
• Radial velocities of early-type stars in the Perseus OB2 association
• The Gould Belt, the de Vaucouleurs-Dolidze Belt, and the Orion Arm
• Pulsating B stars in the Scorpius-Centaurus Association with TESS
• The origin of early-type runaway stars from open clusters
• HR 7355 - another rapidly braking He-strong CP star?
• Homing in on Polaris: A 7 M${}_{\odot }$ first-overtone Cepheid entering the instability strip for the first time
• A wall of dust around a proto-Mira
• Absolute Parameters of YOung Stars: GG Lup and mu^1 Sco
• The low mass population of the Vela OB2 association from Gaia
• A mid-infrared study of very low mass stars and brown dwarfs in Upper Scorpius
• AO Assisted Near-IR Spectroscopy of SVS 13 and its Jet
• The Gaia-ESO Survey: N-body modelling of the Gamma Velorum cluster
• New member candidates of Upper Scorpius from Gaia DR1
• Kinematics of the Gould Belt Based on Open Clusters
• Low Mass Star Formation in the Gum Nebula: The CG~30/31/38 complex
• New low-mass members of Chamaeleon I and $\epsilon$ Cha
• Multiple emission components in the Cygnus cocoon detected from Fermi-LAT observations
• Distances to nearby molecular clouds traced by young stars
• The Origin of the Young Pulsar PSR J0826+2637 and Its Possible Former Companion HIP 13962
• Multiple kinematical populations in Vela OB2 from Gaia DR1 data
• Discovery of the Host Cluster for the Fundamental Cepheid Calibrator Zeta Gem
• Kinematics of the Scorpius-Centaurus OB Association
• The Initial Mass Function toward the low-mass end in the Large Magellanic Cloud with HST/WFPC2 Observations
• Intensity-Corrected Herschel Observations of Nearby Isolated Low-Mass Clouds
• Galactic Rotation Parameters Based on Stars from Activ Star-Forming Regions with Data from the Gaia DR2 Catalogue
• The Massive Stellar Population of W49: A Spectroscopic Survey
• The IC2118 association: new T Tauri stars in high-latitude molecular clouds
• Exploring the planetary-mass population in the Upper Scorpius association
• The Gould Belt
• The Structure and 3D Kinematics of Vela OB2
• A HARPS radial velocity search for planets in the Scorpius-Centaurus association. And its combination with the HARPS and SOPHIE young nearby stars (YNS) surveys
• The Physical Structure of Protoplanetary Disks: the Serpens Cluster Compared with Other Regions
• The physical properties of Cluster Chains
• Analysis of the Kinematic Structure of the Cygnus OB1 association
• Dynamical star forming history of Per OB2
• Low mass star formation and subclustering in the HII regions RCW 32, 33 and 27 of the Vela Molecular Ridge. A photometric diagnostics to identify M-type stars
• The cosmic DANCe of Perseus I: Membership, phase-space structure, mass, and energy distributions
• Squeezed between shells? On the origin of the Lupus I molecular cloud. - II. APEX CO and GASS HI observations
• Angular Momentum Evolution of Young Stars in the Nearby Scorpius-Centaurus OB Association
• Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of runaway stars
• A sub-AU outwardly truncated accretion disk around a classical T Tauri star
• High Resolution Spectroscopy and Spectropolarimetry of some late F-/early G-type sun-like stars as targets for Zeeman Doppler imaging
• A kinematically hot population of young stars in the solar neighbourhood
• Birth Sites of Young Stellar Associations and Recent Star Formation in a Flocculent Corrugated Disk
• The TEMPO Survey I: Predicting Yields of the Transiting Exosatellites, Moons, and Planets from a 30-day Survey of Orion with the Nancy Grace Roman Space Telescope
• Outflow - Core Interaction in Barnard 1
• Surface density of the young cluster IC 348 in the Perseus molecular cloud
• Observational studies of early-type binary stars: VV Orionis
• Membership analysis and 3D kinematics of the star-forming complex around Trumpler 37 using Gaia-DR3
• On the Formation of Perseus OB1 at High Galactic Latitudes
• Constraining the period of the ringed secondary companion to the young star J1407 with photographic plates
• Interstellar magnetic cannon targeting the Galactic halo : A young bubble at the origin of the Ophiuchus and Lupus molecular complexes
• Anchoring the Distance Scale via X-ray/IR Data for Cepheid Clusters: SU Cas
• Hubble Space Telescope: Snapshot Survey for Resolved Companions of Galactic Cepheids
• The Structure and the Distance of Collinder 121 from Hipparcos and Photometry: Resolving the Discrepancy
• The Galactic Spatial Distribution of OB Associations and Their Surrounding Supernova-Generated Superbubble
• Supernova Ejecta in Ocean Cores Used as Time Constraints for Nearby Stellar Groups
• Hot debris dust around HD 106797
• Multiplicity of stars with planets in the solar neighbourhood
• A Survey for a Coeval, Comoving Group Associated with HD 141569
• Open Clusters IC 4665 and Cr 359 and a Probable Birthplace of the Pulsar PSR B1929+10
• Observations of Water Masers in the NGC 1333 IRAS 4 Region
• Hazy with a chance of star spots: constraining the atmosphere of the young planet, K2-33b
• Multiples among B stars in the Scorpius-Centaurus association
• Laser Guide Star Adaptive Optics Integral Field Spectroscopy of a Tightly Collimated Bipolar Jet from the Herbig Ae star LkHa 233
• Near-infrared spectroscopy of the massive stellar population of W51: evidence for multi-seeded star formation
• Tracing the origins of permitted emission lines in RU Lupi down to AU scales
• Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array
• Flares of accretion activity of the 20 Myr old UXOR RZ Psc
• The Rotation-Disk Connection in Young Brown Dwarfs: Strong Evidence for Early Rotational Braking
• Atomic Gas in Debris Discs
• Apocenter pile-up and arcs: a narrow dust ring around HD 129590
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• Search for OB associations in {\sl Gaia} early Data Release 3
• The Stellar "Snake" I: Whole Structure and Properties
• The historical record of massive star formation in Cygnus
• A wide survey for circumstellar disks in the Lupus complex
• Discovery of δ Scuti Pulsations in the Young Hybrid Debris Disk Star HD 156623
• New Parallaxes for the Upper Scorpius OB Association
• Orbital perturbations due to massive rings
• Where is the warm H2 ? A search for H2 emission from disks around Herbig Ae/Be stars
• The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars
• Is the stellar system WR 11 a gamma-ray source?
• Observations of 6 - 200 μm emission of the Ophiuchus cloud LDN 1688
• Formation History of HD106906 and the Vertical Warping of Debris Disks by an External Inclined Companion
• Protostar L1455 IRS1: Rotating Disk Connecting to Filamentary Network
• VIBES: VIsual Binary Exoplanet survey with SPHERE Upper limits on wide S-planet and S-BD frequencies, triple system discovery, and astrometric confirmation of 20 stellar binaries and three triple systems
• Resolved star formation in the metal poor star-forming region Magellanic Bridge C
• Direct Imaging Discovery of a Young Brown Dwarf Companion to an A2V Star
• HD 101088, An Accreting 14 AU Binary in Lower Centaurus Crux With Very Little Circumstellar Dust
• A spectroscopically confirmed Gaia-selected sample of 318 new young stars within $\sim$200 pc
• Light Element Abundance Patterns in the Orion Association: I) HST Observations of Boron in G-dwarfs
• VISIONS: The VISTA Star Formation Atlas -- I. Survey overview
• Chandra Characterization of X-ray Emission in the Young F-Star Binary System HD 113766
• Dynamical Measurements of the Young Upper Scorpius Triple NTTS 155808-2219
• BRITE observations of $\nu$ Centauri and $\gamma$ Lupi, the first non-eclipsing members of the new class of nascent binaries
• Search for Brown Dwarfs in IC 1396 with Subaru HSC: Interpreting the Impact of Environmental Factors on Sub-stellar Population
• Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348
• An SMA Continuum Survey of Circumstellar Disks in the Serpens Star-Forming Region
• Optical and UV surface brightness of translucent dark nebulae: Dust albedo, radiation field and fluorescence emission by H2
• ROSAT-HRI detection of the Class I protostar YLW16A in the rho Ophiuchi dark cloud
• A TGAS/Gaia DR1 parallactic distance to the sigma Orionis cluster
• An inner warp discovered in the disk around HD 110058 using VLT/SPHERE and HST/STIS
• ODEA: Orbital Dynamics in a complex Evolving Architecture -- Application to the planetary system HD 106906
• Evidence for Evolution Among Primordial Disks in the 5 Myr Old Upper Scorpius OB Association
• An imaged 15Mjup companion within a hierarchical quadruple system
• Reaching the boundary between stellar kinematic groups and very wide binaries. IV. The widest Washington double star systems with rho > 1000 arcsec in Gaia DR3
• PDS 144: The First Confirmed Herbig Ae - Herbig Ae Wide Binary
• The Distribution of UV Radiation Field in the Molecular Clouds of Gould Belt
• Proper Motions and Shock Wave Dynamics in the HH 7-11 Stellar Jet
• HD 60431, the CP2 star with the shortest rotational period -- Physical parameters and period analysis
• A Wide-Field Near-Ir H2 2.122$\mu$m line survey of the Braid Nebula Star Formation Region in Cygnus OB7
• Investigating the Upper Scorpius OB association with HERMES. I. The spectroscopic sample and 6D kinematics
• Kinematics of OB Stars with Data from the LAMOST and Gaia Catalogues
• X-ray Detections of Two Young Bona-Fide Brown Dwarfs
• Radial velocity survey of spatially resolved young, low-mass binaries
• Ultraviolet Spectropolarimetry with Polstar: Interstellar Medium Science
• Kinematics of the Young Stellar Objects associated with the Cometary Globules in the Gum Nebula
• 3D maps of the local interstellar medium: searching for the imprints of past events
• V410 Puppis: A useful laboratory for early stellar evolution
• The massive eclipsing system ALS 1135 and variable stars in the field of the distant OB association Bochum 7
• Proper motions of Upper Sco T-type candidates
• ADONIS observations of X-ray emitting late B-type stars in Lindroos systems
• Narrow belt of debris around the Sco-Cen star HD 141011
• New Expansion Rate Estimate of the Scorpius-Centaurus Association Based on T Tauri Stars from the Gaia DR2 Catalog
• The $\text{Gaia}$ view of the Cepheus OB2 association
• Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
• X-raying the Sco-Cen OB association: The low-mass stellar population revealed by eROSITA
• Interstellar reddening towards six small areas in Puppis-Vela
• Mapping and characterizing magnetic fields in the Rho Ophiuchus-A molecular cloud with SOFIA/HAWC$+$
• Ultraviolet Study of the Active Interacting Binary Star R Arae using Archival IUE Data
• Spectroscopy of Candidate Members of the Sco-Cen Complex
• Massive Stellar Content of the Galactic Supershell GSH 305+01-24
• GSH 90-28-17: a Possible Old Supernova Remnant
• Unveiling wide-orbit companions to K-type stars in Sco-Cen with Gaia EDR3
• XHIP-II: Clusters and associations
• Spectroscopic confirmation of UV-bright white dwarfs from the Sandage Two-Color Survey of the Galactic Plane
• BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
• Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary
• Kinematic Peculiarities of Gould Belt Stars
• The surface brightness of the Galaxy at the Solar Neighbourhood
• Field ZAMS stars in the solar neighborhood: Where have they come from ?
• A Novel Survey for Young Substellar Objects with the W band Filter.V. IC 348 and Barnard 5 in the Perseus Cloud
• Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2
• Determining the evolutionary stage of the delta Scuti star HIP 80088 with asteroseismology
• Peculiarities of Open Star Clusters with High Vertical Velocities from the Region of the Sco-Cen OB Association
• The System of Molecular Clouds in the Gould Belt
• Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon
• A Search for Small-Scale Anisotropy of PeV Cosmic Rays
• GS305+04-26:Revisiting the ISM around the CenOB1 stellar association
• Velocity Dispersion of Dissolving OB Associations Affected by External Pressure of Formation Environment
• Asteroseismology of the pre-main-sequence $\delta$ Scuti pulsator IP Persei
• Searching for Wide Companions and Identifying Circum(sub)stellar Disks through PSF-Fitting of Spitzer/IRAC Archival Images
• Estimation of the Gould Belt scale height from T Tauri type stars in the Gaia DR2 catalogue
• WIde Separation Planets In Time (WISPIT): Two directly imaged exoplanets around the Sun-like stellar binary WISPIT 1
• A New Nearby Candidate Star Cluster in Ophiuchus at d = 170 pc
• Imaging the positron annihilation line with 20 years of INTEGRAL/SPI observations
• Kinematics of T Tauri Stars Close to the Sun from the Gaia DR2 Catalogue
• Candidate exoplanet host HD131399A: a nascent Am star
• GPI+SPHERE detection of a 6.1 $M_{\text{Jup}}$ circumbinary planet around HD 143811
• Finding the most variable stars in the Orion Belt with the All Sky Automated Survey
• A Search for a Globular Cluster whose Passage through the Galactic Disk Could Induce the Formation of the Gould Belt
• A search for planetary-mass objects and brown dwarfs in the Upper Scorpius association
• Discovery of two new bright magnetic B stars: i Car and Atlas
• Revisiting the Local Interstellar Radiation Field using Gaia DR3
• DECam Survey for Low-Mass Stars and Substellar Objects in the UCL and LCC Subgroups of the Sco-Cen OB Association (SCOCENSUS)
• Pre-main sequence population of Sco-Cen unveiled with Gaia DR2
• Stellar clustering and the kinematics of stars around Collinder 121 using Gaia DR3
• HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
• Using radioactivities to improve the search for nearby radio-quiet neutron stars
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS). X. Interpreting the peculiar dust rings around HD 131835
• Massive Young Clusters
• Walking the Line: Young Stars on the Boundary of the Epsilon Cha and Lower Centaurus-Crux Associations
• The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association
• RX J0942.7-7726AB: an isolated pre-main sequence wide binary
• Common Proper Motion Search for Faint Companions Around Early-Type Field Stars - Progress Report - II
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• SDSS J100711.74+193056.2: A Candidate Common Motion Substellar Companion to the Nearest B-Type Star Regulus
• How common can the origin of clusters Cha I, Cha II, epsilon Cha and eta Cha be?
• Improved proper motion determinations for 15 open clusters based on the UCAC4 catalog
• A search for OB stars in the field of the galactic OB association Bochum 7
• Exoplanet detection and its dependence on stochastic sampling of the stellar Initial Mass Function
• TYCHO -- Realistically Simulating Exoplanets within Stellar Clusters I: Improving the Monte Carlo Approach
• Discovery of Two Different Full Disk Evolutionary Patterns of M-type T Tauri Stars with LAMOST DR8
• On the Hα faintness of the North Polar Spur
• The evolution of velocity dispersion in the Sco-Cen OB association
• Three new late-type stellar companions to very dusty WISE debris disks identified with VLT/SPHERE imaging
• Characterization of the Young Open Cluster G144.9+0.4 in the Camelopardalis OB1 Association
• Solar-Type Post-T Tauri Stars in the Nearest OB Subgroups
• Nuclear astrophysics
• Kinematics of Fainst Stars of the Sco-Cen Association According to Gaia Catalog
• The INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
• Spectroscopy of Brown Dwarf Candidates in the NGC 1333 Molecular Cloud
• Environments of massive stars and the upper mass limit
• X-Shooter survey of disk accretion in Upper Scorpius I. Very high accretion rates at age>5 Myr
• Using ages and kinematic traceback: the origin of young local associations
• Massive-Star Nucleosynthesis and INTEGRAL
• Gould Belt Kinematics on the Base of the Open Clusters and Ob-Associations
• Gould's Belt to Starburst Galaxies: The IMF of Extreme Star Formation
• Place of the Radcliffe Wave in the Local System
• A planetary-mass candidate imaged in the Young Suns Exoplanet Survey
• Constraining the mass of the planet(s) sculpting a disk cavity. The intriguing case of 2MASS J16042165-2130284
• A Multi-Wavelength Study of the Highly Asymmetrical Debris Disk Around HD 111520