High Velocity Stars in SDSS/APOGEE DR17

Abstract

We report 23 stars having Galactocentric velocities larger than $450{\mathrm{km}\mathrm{s}}^{-1}$ in the final data release of the APOGEE survey. This sample was generated using space velocities derived by complementing the high quality radial velocities from the APOGEE project in Sloan Digital Sky Survey's Data Release 17 (DR17) with distances and proper motions from Gaia early Data Release 3 (eDR3). We analyze the observed kinematics and derived dynamics of these stars, considering different potential models for the Galaxy. We find that three stars could be unbound depending on the adopted potential, but in general all of the stars show typical kinematics of halo stars. The APOGEE DR17 spectroscopic results and Gaia eDR3 photometry are used to assess the stellar parameters and chemical properties of the stars. All of the stars belong to the red giant branch, and, in general, they follow the abundance pattern of typical halo stars. There are a few exceptions that would deserve further analysis through high-resolution spectroscopy. In particular, we identify a high velocity Carbon-Enhanced Metal-Poor (CEMP) star, with Galactocentric velocity of 482 km\,s${}^{-1}$. We do not confirm any hypervelocity star in the sample, but this result is very sensitive to the adopted distances, and less sensitive to the Galactic potential.

arXiv comment10 figures, 7 tables, submitted to Astronomical Journal

References in corpus (92)

• Astropy: A Community Python Package for Astronomy
• Gaia Data Release 2. Summary of the contents and survey properties
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• Modules for Experiments in Stellar Astrophysics (MESA)
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• galpy: A Python Library for Galactic Dynamics
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• The New Galaxy: Signatures of its Formation
• The mass distribution and gravitational potential of the Milky Way
• Co-formation of the Galactic disc and the stellar halo
• Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
• Gaia Early Data Release 3: Photometric content and validation
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
• Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Vertical waves in the solar neighbourhood in Gaia DR2
• The Data Reduction Pipeline for the Apache Point Observatory Galactic Evolution Experiment
• A Spectroscopic Study of the Ancient Milky Way: F- and G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey
• Abundances, Stellar Parameters, and Spectra From the SDSS-III/APOGEE Survey
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• The RAVE survey: the Galactic escape speed and the mass of the Milky Way
• The Biggest Splash
• Target Selection for the SDSS-IV APOGEE-2 Survey
• The origin of accreted stellar halo populations in the Milky Way using APOGEE, $\text{Gaia}$, and the EAGLE simulations
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions
• Actions for axisymmetric potentials
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18
• New ATLAS9 And MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Three Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-Degenerate Double-Detonation Type Ia Supernovae
• Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• StarHorse: A Bayesian tool for determining stellar masses, ages, distances, and extinctions for field stars
• The Milky Way has no in-situ halo other than the heated thick disc. Composition of the stellar halo and age-dating the last significant merger with Gaia DR2 and APOGEE
• Using chemical tagging to redefine the interface of the Galactic disk and halo
• The GALAH Survey: Observational Overview and Gaia DR1 companion
• From dawn till disk: Milky Way's turbulent youth revealed by the APOGEE+Gaia data
• Milky Way Mass Models for Orbit Calculations
• Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
• From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
• The SDSS-III APOGEE Spectral Line List for H-band Spectroscopy
• Gaia Data Release 2: The catalogue of radial velocity standard stars
• Simultaneous calibration of spectro-photometric distances and the Gaia DR2 parallax zero-point offset with deep learning
• APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons With Independent Analyses
• The APOGEE Data Release 16 Spectral Line List
• APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
• MMT Hypervelocity Star Survey III: A Complete Survey of Faint B-type Stars in the Northern Milky Way Halo
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• Taking the Measure of the Universe: Precision Astrometry with SIM PlanetQuest
• New Type Ia supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies
• Probing the Shape of the Galactic Halo with Hyper-Velocity Stars
• Measuring the Mass of the Large Magellanic Cloud with Stellar Streams Observed by $S^5$
• A classifier for spurious astrometric solutions in Gaia EDR3
• An Alternative Origin for Hypervelocity Stars
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
• Gaia DR2 in 6D: Searching for the fastest stars in the Galaxy
• Revisiting hypervelocity stars after Gaia DR2
• Chemo-dynamics of outer halo dwarf stars, including \textit{Gaia}-Sausage and \textit{Gaia}-Sequoia candidates
• Gaia and the Galactic Center Origin of Hypervelocity Stars
• Kinematics of hypervelocity stars in the triaxial halo of the Milky Way
• High velocity stars from close interaction of a globular cluster and a super massive black hole
• HD 271791: An Extreme Supernova Runaway B Star Escaping from the Galaxy
• The relation between chemical abundances and kinematics of the Galactic disc with RAVE
• Old, Metal-Poor Extreme Velocity Stars in the Solar Neighborhood
• Microarcsecond Astrometry: Science Highlights from Gaia
• Hypervelocity stars in the Gaia era: Runaway B stars beyond the velocity limit of classical ejection mechanisms
• A Dipole on the Sky: Predictions for Hypervelocity Stars from the Large Magellanic Cloud
• A Gaia early DR3 mock stellar catalog: Galactic prior and selection function
• 591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
• The Fastest Travel Together: Chemical Tagging of the Fastest Stars in Gaia DR2 to the Stellar Halo
• Aluminum Enhanced Metal-Poor Stars buried in the Inner Galaxy
• Gaia EDR3 in 6D: Searching for unbound stars in the Galaxy
• The Metal-Poor Stellar Halo in RAVE-TGAS and its Implications for the Velocity Distribution of Dark Matter
• CD-62\degree1346: an extreme halo or hypervelocity CH~star?
• Hypervelocity Stars in the Gaia era. Revisiting the most extreme stars from the MMT survey
• Constraining Solar position and velocity with a Nearby Hypervelocity Star
• The Chemical Composition of Extreme-Velocity Stars

Cited by in corpus (5)

• On the origins of extreme velocity stars as revealed by large-scale Galactic surveys
• Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
• Open cluster members in APOGEE DR17 I. Dynamics and star members
• Searching for new Hypervelocity Stars with Gaia DR3 and VLT/FORS2 Spectroscopy
• Gaia DR3 high radial velocity stars: Genuine fast-moving objects or outliers?