Search Publications
Coupling hydrodynamics with comoving frame radiative transfer. I. A unified approach for OB and WR stars
Hamann, W. -R.; Sander, A. A. C.; Shenar, T. +2 more
Context. For more than two decades, stellar atmosphere codes have been used to derive the stellar and wind parameters of massive stars. Although they have become a powerful tool and sufficiently reproduce the observed spectral appearance, they can hardly be used for more than measuring parameters. One major obstacle is their inconsistency between …
Revealing the structure of the outer disks of Be stars
Carciofi, A. C.; Štefl, S.; Vieira, R. G. +9 more
Context. The structure of the inner parts of Be star disks (≲ 20 stellar radii) is well explained by the viscous decretion disk (VDD) model, which is able to reproduce the observable properties of most of the objects studied so far. The outer parts, on the other hand, are not observationally well-explored, as they are observable only at radio wave…
The Tarantula Massive Binary Monitoring. II. First SB2 orbital and spectroscopic analysis for the Wolf-Rayet binary R145
Ulaczyk, K.; Sander, A.; Crowther, P. A. +19 more
We present the first SB2 orbital solution and disentanglement of the massive Wolf-Rayet binary R145 (P = 159 d) located in the Large Magellanic Cloud. The primary was claimed to have a stellar mass greater than 300 M⊙, making it a candidate for being the most massive star known to date. While the primary is a known late-type, H-rich Wol…
Polyaromatic disordered carbon grains as carriers of the UV bump: Far-UV to mid-IR spectroscopy of laboratory analogs
Dartois, E.; Giuliani, A.; Pino, T. +3 more
Context. A multiwavelength study of laboratory carbons with varying degrees of hydrogenation and sp2 hybridization is required to characterize the structure of the carbonaceous carriers of interstellar and circumstellar extinction.
Aims: We study the spectral properties of carbonaceous dust analogs from the far-ultraviolet to the m…
Spectroscopic and photometric oscillatory envelope variability during the S Doradus outburst of the luminous blue variable R71
Stahl, O.; Asmus, D.; Bartlett, E. S. +7 more
Context. Luminous blue variables (LBVs) are evolved massive stars that exhibit instabilities that are not yet understood. Stars can lose several solar masses during this evolutionary phase. The LBV phenomenon is thus critical to our understanding of the evolution of the most massive stars.
Aims: The LBV R71 in the Large Magellanic Cloud is pr…
Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars. Candidate hypervelocity star discovery and the nature of R 71
van der Marel, Roeland P.; Lennon, Daniel J.; Sahlmann, Johannes +2 more
Aims: Our research aims to search for runaway stars in the Large Magellanic Cloud (LMC) among the bright Hipparcos supergiant stars included in the Gaia DR1 Tycho-Gaia astrometric solution (TGAS) catalogue.
Methods: We compute the space velocities of the visually brightest stars in the Large Magellanic Cloud that are included in the TGAS…
Just how hot are the ω Centauri extreme horizontal branch pulsators?
Ely, J.; Latour, M.; Chayer, P. +5 more
Context. Past studies based on optical spectroscopy suggest that the five
Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus
Skopal, A.; Shagatova, N.
Context. Light curves (LCs) of some symbiotic stars show a different slope of the ascending and descending branch of their minimum profile. The origin of this asymmetry is not well understood.
Aims: We explain this effect in the ultraviolet LCs of the symbiotic binary SY Mus.
Methods: We model the continuum fluxes in the spectra obtained…