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On the origin of microturbulence in hot stars
M. Cantiello, N. Langer, I. Brott +5
We present results from the first extensive study of convection zones in the envelopes of hot massive stars, which are caused by opacity peaks associated with iron and helium ioniz…
Multiple ring nebulae around blue supergiants
S. M. Chita, N. Langer, A. J. van Marle +2
In the course of the life of a massive star, wind-wind interaction can give rise to the formation of circumstellar nebulae which are both predicted and observed in the nature. We p…
Thermohaline mixing in low-mass giants
M. Cantiello, N. Langer
Thermohaline mixing has recently been proposed to occur in low mass red giants, with large consequences for the chemical yields of low mass stars. We investigate the role of thermo…
Rotational mixing in close binaries
S. E. de Mink, M. Cantiello, N. Langer +5
Rotational mixing is a very important but uncertain process in the evolution of massive stars. We propose to use close binaries to test its efficiency. Based on rotating single ste…
Evolution of massive stars at very low metallicity including rotation and binary interactions
S. -C. Yoon, M. Cantiello, N. Langer
We discuss recent models on the evolution of massive stars at very low metallicity including the effects of rotation, magnetic fields and binarity. Very metal poor stars lose very…
Evolution of progenitor stars of Type Ibc supernovae and long gamma-ray bursts
S. -C. Yoon, N. Langer, M. Cantiello +2
We discuss how rotation and binary interactions may be related to the diversity of type Ibc supernovae and long gamma-ray bursts. After presenting recent evolutionary models of mas…
The circumstellar medium around a rapidly rotating, chemically homogeneously evolving, possible gamma-ray burst progenitor
Allard Jan van Marle, Norbert Langer, Sung-Chul Yoon +1
Rapidly rotating, chemically homogeneously evolving massive stars are considered to be progenitors of long gamma-ray bursts. We present numerical simulations of the evolution of th…
The VLT-FLAMES survey of massive stars: rotation and nitrogen enrichment as the key to understanding massive star evolution
I. Hunter, I. Brott, D. J. Lennon +7
Rotation has become an important element in evolutionary models of massive stars, specifically via the prediction of rotational mixing. Here, we study a sample of stars, including…
How Efficient is Rotational Mixing in Massive Stars ?
I. Brott, I. Hunter, P. Anders +1
The VLT-Flames Survey for Massive Stars (Evans05,Evans06) provides recise measurements of rotational velocities and nitrogen surface abundances of massive stars in the Magellanic C…
Thermohaline mixing in low-mass giants: RGB and beyond
M. Cantiello, H. Hoekstra, N. Langer +1
Thermohaline mixing has recently been proposed to occur in low mass red giants, with large consequence for the chemical yields of low mass stars. We investigate the role of thermoh…
The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
M. R. Mokiem, A. de Koter, J. S. Vink +9
[Abridged] We present a comprehensive study of the metallicity dependence of the mass-loss rates in stationary stellar winds of hot massive stars. Assuming a power-law dependence o…
Pair creation supernovae at low and high redshift
N. Langer, C. A. Norman, A. de Koter +3
Pair creation supernovae (PCSN) are thought to be produced from very massive low metallicity stars. The spectacularly bright SN 2006gy does show signatures expected from PCSNe. Her…
The VLT-FLAMES survey of massive stars: Wind properties and evolution of hot massive stars in the LMC
M. R. Mokiem, A. de Koter, C. J. Evans +9
[Abridged] We have studied the optical spectra of 28 O- and early B-type stars in the Large Magellanic Cloud, 22 of which are associated with the young star-forming region N11. Ste…
Binary star progenitors of long gamma-ray bursts
M. Cantiello, S. -C. Yoon, N. Langer +1
We present a binary channel for the progenitors of long gamma-ray bursts. We test the idea of producing rapidly rotating Wolf-Rayet stars in massive close binaries through mass acc…
Tides in asynchronous binary systems
Oswaldo Toledano, Edmundo Moreno, Gloria Koenigsberger +2
Stellar oscillations are excited in non-synchronously rotating stars in binary systems due to the tidal forces. Tangential components of the tides can drive a shear flow which beha…
The VLT-FLAMES survey of massive stars: Mass loss and rotation of early-type stars in the SMC
M. R. Mokiem, A. de Koter, C. J. Evans +9
We have studied the optical spectra of a sample of 31 O- and early B-type stars in the Small Magellanic Cloud, 21 of which are associated with the young massive cluster NGC 346. St…
Multi-Dimensional Simulations of the Accretion-Induced Collapse of White Dwarfs to Neutron Stars
Luc Dessart, Adam Burrows, Christian Ott +3
We present 2.5D radiation-hydrodynamics simulations of the accretion-induced collapse (AIC) of white dwarfs, starting from 2D rotational equilibrium configurations of a 1.46-Msun a…
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…
On the evolution of rapidly rotating massive white dwarfs towards supernovae or collapses
Sung-Chul Yoon, Norbert Langer
A recent study by Yoon & Langer (2004a) indicated that the inner cores of rapidly accreting (Mdot > 10^{-7} M_sun/yr) CO white dwarfs may rotate differentially, with a shear rate n…