Publications (34)
Rejuvenation of stellar mergers and the origin of magnetic fields in massive stars
Fabian R. N. Schneider, Philipp Podsiadlowski, Norbert Langer +2
Approximately 10% of massive OBA main-sequence (MS) and pre-MS stars harbour strong, large-scale magnetic fields. At the same time there is a dearth of magnetic stars in close bina…
MUSE crowded field 3D spectroscopy in NGC 300 II. Quantitative spectroscopy of BA-type supergiants
Gemma González-TorÃ, Miguel A. Urbaneja, Norbert Przybilla +4
A quantitative spectral analysis of BA-type supergiants and bright giants in an inner spiral arm region of the nearby spiral galaxy NGC 300 is presented, based on observations with…
Origin of a massive hyper-runaway subgiant star LAMOST-HVS1 -- implication from Gaia and follow-up spectroscopy
Kohei Hattori, Monica Valluri, Norberto Castro +3
We report that LAMOST-HVS1 is a massive hyper-runaway subgiant star with mass of 8.3 Msun and super-Solar metallicity, ejected from the inner stellar disk of the Milky Way 3…
The Wide-field Spectroscopic Telescope (WST) Science White Paper
Vincenzo Mainieri, Richard I. Anderson, Jarle Brinchmann +214
The Wide-field Spectroscopic Telescope (WST) is proposed as a new facility dedicated to the efficient delivery of spectroscopic surveys. This white paper summarises the initial con…
Constraining Solar position and velocity with a Nearby Hypervelocity Star
Kohei Hattori, Monica Valluri, Norberto Castro
Gravitational 3-body interaction among binary stars and the supermassive black hole (SMBH) at the center of the Milky Way occasionally ejects a hypervelocity star (HVS) with a velo…
The Blue Multi Unit Spectroscopic Explorer (BlueMUSE) on the VLT: science drivers and overview of instrument design
Johan Richard, Rémi Giroud, Florence Laurent +47
BlueMUSE is a blue-optimised, medium spectral resolution, panoramic integral field spectrograph under development for the Very Large Telescope (VLT). With an optimised transmission…
Metallicity dependence of turbulent pressure and macroturbulence in stellar envelopes
Luca Grassitelli, Luca Fossati, Norbert Langer +3
Macroturbulence, introduced as a fudge to reproduce the width and shape of stellar absorption lines, reflects gas motions in stellar atmospheres. While in cool stars, it is thought…
MUSE 3D spectroscopy of BA-type supergiants in NGC 300
Gemma González-TorÃ, Miguel A. Urbaneja, Norbert Przybilla +4
We present the results obtained using spectroscopic data taken with the intermediateresolution Multi Unit Spectroscopic Explorer (MUSE) of B and A-type supergiants and bright giant…
New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling
Irene Vargas-Salazar, M. S. Oey, Jan J. Eldridge +9
We present a radial velocity (RV) survey of the field OB and OBe stars of the SMC Wing. We use multi-epoch observations of 55 targets obtained with the Magellan IMACS and M2FS mult…
Stellar mergers as the origin of the blue main-sequence band in young star clusters
Chen Wang, Norbert Langer, Abel Schootemeijer +10
Recent high-quality Hubble Space Telescope (HST) photometry shows that the main sequences (MS) stars of young star clusters form two discrete components in the color-magnitude diag…
Multiwavelength study of the fast rotating supergiant high-mass X-ray binary IGR J16465-4507
Sylvain Chaty, Audrey LeReun, Ignacio Negueruela +6
Since its launch, the X-ray and gamma-ray observatory INTEGRAL satellite has revealed a new class of high-mass X-ray binaries (HMXB) displaying fast flares and hosting supergiant c…
BlueMUSE: Project Overview and Science Cases
Johan Richard, Roland Bacon, Jérémy Blaizot +59
We present the concept of BlueMUSE, a blue-optimised, medium spectral resolution, panoramic integral field spectrograph based on the MUSE concept and proposed for the Very Large Te…
NGC 663 as a laboratory for massive star evolution
Amparo Marco, Ignacio Negueruela, Norberto Castro +1
Massive young clusters with rich populations of high-mass stars are ideal laboratories to explore their evolutionary paths. Despite being the most prominent cluster in the Perseus-…
The Blue Multi Unit Spectroscopic Explorer (BlueMUSE) on the VLT: End-To-End simulator 'BlueSi'
Martin Wendt, Norberto Castro, Sven Martens +4
BlueMUSE is a blue, medium spectral resolution, panoramic integral-field spectrograph under development for the Very Large Telescope (VLT). We demonstrate and discuss an early End-…
A new reference catalogue for the very metal-poor Universe: +150 OB stars in Sextans A
Marta Lorenzo, Miriam Garcia, Francisco Najarro +3
Local Group (LG) very metal-poor massive stars are the best proxy for the First Stars of the Universe and fundamental to modelling the evolution of early galaxies. These stars may…
Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
Dominic M. Bowman, Siemen Burssens, May G. Pedersen +14
Almost all massive stars explode as supernovae and form a black hole or neutron star. The remnant mass and the impact of the chemical yield on subsequent star formation and galacti…
In savvy pursuit of Local Group blue massive stars
Miriam Garcia, Artemio Herrero, Norberto Castro +1
The important role of metallicity on massive star evolution and the combination of multi-object spectrographs and 10m class telescopes, have lead to numerous systematic studies of…
Runaway OB Stars in the Small Magellanic Cloud III. Updated Kinematics and Insights on Dynamical vs. Supernova Ejections
Grant D. Phillips, M. S. Oey, Maria Cuevas +2
We use the kinematics of field OB stars to estimate the frequencies of runaway stars generated by the dynamical ejection scenario (DES), the binary supernova scenario (BSS), and th…
Dissecting the Core of the Tarantula Nebula with MUSE
Paul A Crowther, Norberto Castro, Chris Evans +3
We provide an overview of Science Verification MUSE observations of NGC 2070, the central region of the Tarantula Nebula in the Large Magellanic Cloud. Integral-field spectroscopy…
Constraints on Binarity for the Extreme Oe Variable Star AzV 493
M. S. Oey, Irene Vargas-Salazar, Edmund Hodges-Kluck +6
The extreme Oe star AzV 493 is known to show unusual photometric and spectroscopic variability that suggest the presence of an unseen companion in a highly eccentric and long-perio…
Resolving stellar populations with integral field spectroscopy
Martin M. Roth, Peter M. Weilbacher, Norberto Castro
High-performance instruments at large ground-based telescopes have made integral field spectroscopy (IFS) a powerful tool for the study of extended objects such as galaxies, nebula…
Low-metallicity (sub-SMC) massive stars
Miriam Garcia, Artemio Herrero, Francisco Najarro +4
The double distance and metallicity frontier marked by the SMC has been finally broken with the aid of powerful multi-object spectrographs installed at 8-10m class telescopes. VLT,…
A reference framework for extremely metal-poor OB star studies: calibrations for stellar parameters and intrinsic colours
Marta Lorenzo, Miriam Garcia, Norberto Castro +4
We provide the first reference framework for extremely metal-poor (XMP) OB-type stars. We parsed a grid of 0.10 FASTWIND models, covering the parameter space of O stars…
MUSE crowded field 3D spectroscopy in NGC 300 : IV. Planetary nebula luminosity function
Azlizan A. Soemitro, Martin M. Roth, Peter M. Weilbacher +5
We perform a deep survey of planetary nebulae (PNe) in the spiral galaxy NGC 300 to construct its planetary nebula luminosity function (PNLF). We aim to derive the distance using t…
Science Enabled by a 30-Meter-Class Telescope in the Northern Hemisphere: Massive Stars at Low Metallicity
Miriam Garcia, Artemio Herrero, Ignacio Negueruela +11
Massive stars are at the core of our observations of the Universe up to the reionization epoch, both through their intense ionizing fluxes and through the energetic end products th…
Classical OBe Stars as Post-Supernova Runaways: Confirming Binary Origins
Matthew M. Dallas, M. S. Oey, Norberto Castro
Massive binaries play an important role in fields ranging from gravitational wave astronomy to stellar evolution. We provide several lines of evidence that classical OBe stars in t…
SALT spectroscopy of the HMXB associated with the LMC supernova remnant MCSNR\,J05136724
Vasilii Gvaramadze, Alexei Kniazev, Norberto Castro +1
We report the results of optical échelle spectroscopy with the Southern African Large Telescope (SALT) of the mass donor star BSDL\,923 in the neutron star (NS) high-mass X-ray bi…
A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
Rolf Kudritzki, Miguel Urbaneja, Norberto Castro +5
Low resolution (4.5 to 5 Angstroem) spectra of 58 blue supergiant stars distributed over the disk of the Magellanic spiral galaxy NGC 55 in the Sculptor group are analyzed by means…
The Distance to the Massive Eclipsing Binary LMC-SC1-105 in the Large Magellanic Cloud
Alceste Z. Bonanos, Norberto Castro, Lucas M. Macri +1
This paper presents the first distance measurement to the massive, semi-detached, eclipsing binary LMC-SC1-105, located in the LH 81 association of the Large Magellanic Cloud (LMC)…
Observational consequences of turbulent pressure in the envelopes of massive stars
Luca Grassitelli, Luca Fossati, Sergio Simon-Diaz +3
The major mass fraction of the envelope of hot luminous stars is radiatively stable. However, the partial ionisation of hydrogen, helium and iron gives rise to extended sub-surface…
Open cluster Dolidze 25: Stellar parameters and the metallicity in the Galactic Anticentre
Ignacio Negueruela, Sergio Simón-DÃaz, Javier Lorenzo +2
The young open cluster Dolidze 25, in the direction of the Galactic Anticentre, has been attributed a very low metallicity, with typical abundances between and dex be…
Precision spectrophotometry for PNLF distances: the case of NGC 300
Azlizan A. Soemitro, Martin M. Roth, Peter M. Weilbacher +5
The Multi-Unit Spectroscopic Explorer (MUSE) has enabled a renaissance of the planetary nebula luminosity function (PNLF) as a standard candle. In the case of NGC 300, we learned t…
Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1
Jonathan Mackey, Norberto Castro, Luca Fossati +1
The massive red supergiant (RSG) W26 in Westerlund 1 is one of a growing number of RSGs shown to have winds that are ionized from the outside in. The fate of this dense wind materi…
Effects of close binary evolution on the main-sequence morphology of young star clusters
Chen Wang, Norbert Langer, Abel Schootemeijer +4
Star clusters are the building blocks of galaxies. They are composed of stars of nearly equal age and chemical composition, allowing us to use them as chronometers and as testbeds…