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Evolution of Gamma-Ray Burst Progenitors at Low Metallicity
Sung-Chul Yoon, Norbert Langer
Despite the growing evidence that long Gamma-Ray Bursts (GRBs) are associated with deaths of Wolf-Rayet stars, the evolutionary path of massive stars to GRBs and the exact nature o…
Evolution of rapidly rotating metal-poor massive stars towards gamma-ray bursts
Sung-Chul Yoon, Norbert Langer
Recent models of rotating massive stars including magnetic fields prove it difficult for the cores of single stars to retain enough angular momentum to produce a collapsar and gamm…
Cosmic Rays VIII
A. S. Popescu, P. L. Biermann, N. Langer
This paper has been withdrawn.
The VLT-FLAMES Survey of Massive Stars: Observations in the Galactic Clusters NGC 3293, NGC 4755 and NGC 6611
C. J. Evans, S. J. Smartt, J. -K. Lee +23
We introduce a new survey of massive stars in the Galaxy and the Magellanic Clouds using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument at the Very Large Tele…
Constraining the mass transfer in massive binaries through progenitor evolution models of Wolf-Rayet+O binaries
Jelena Petrovic, Norbert Langer, Karel A. van der hucht
Since close WR+O binaries are the result of a strong interaction of both stars in massive close binary systems, they can be used to constrain the highly uncertain mass and angular…
Which Massive stars are Gamma-Ray Burst Progenitors?
Jelena Petrovic, Norbert Langer, Sung-Chul Yoon +1
The collapsar model for gamma-ray bursts requires three essential ingredients: a massive core, removal of the hydrogen envelope, and enough angular momentum in the core. We study c…