204 citations · 1.6k across the 32 of their papers we have counts for
6 papers · 1 filter
On the apparent absence of WR+NS systems: the curious case of WR124
J. A. Toala, L. M. Oskinova, W. -R. Hamann +8
Among different types of massive stars in advanced evolutionary stages is the enigmatic WN8h type. There are only a few Wolf-Rayet (WR) stars with this spectral type in our Galaxy.…
PoWR grids of non-LTE model atmospheres for OB-type stars of various metallicities
R. Hainich, V. Ramachandran, T. Shenar +5
The study of massive stars in different metallicity environments is a central topic of current stellar research. The spectral analysis of massive stars requires adequate model atmo…
The extreme O-type spectroscopic binary HD 93129A
D. Gruner, R. Hainich, A. A. C. Sander +6
HD 93129A was classified as the earliest O-type star in the Galaxy (O2~If*) and is considered as the prototype of its spectral class. However, interferometry shows that this object…
Low-metallicity massive single stars with rotation. II. Predicting spectra and spectral classes of chemically-homogeneously evolving stars
B. Kubátová, D. Szécsi, A. A. C. Sander +7
Context. Metal-poor massive stars are supposed to be progenitors of certain supernovae, gamma-ray bursts and compact object mergers, potentially contributing to the early epochs of…
The Galactic WC and WO stars: The impact of revised distances from Gaia DR2 and their role as massive black hole progenitors
Andreas A. C. Sander, Wolf-Rainer Hamann, Helge Todt +4
Wolf-Rayet stars of the carbon sequence (WC stars) are an important cornerstone in the late evolution of massive stars before their core collapse. As core-helium burning, hydrogen-…
Stellar population of the superbubble N206 in the LMC II. Parameters of the OB and WR stars, and the total massive star feedback
Varsha Ramachandran, W. -R. Hamann, R. Hainich +5
Clusters or associations of early-type stars are often associated with a 'superbubble' of hot gas. The formation of such superbubbles is caused by the feedback from massive stars.…