Long GRBs from binary stars: runaway, Wolf-Rayet progenitors

Details Long GRBs from binary stars: runaway, Wolf-Rayet progenitors Long GRBs from binary stars: runaway, Wolf-Rayet progenitors

2007-09-06

arxiv.org/abs/0709.0829v1

AIP Conf.Proc.948:413-418,2007

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the conference "Unsolved problems in stellar physics" - Cambridge, July 2007

Scientific paper

10.1063/1.2819002

The collapsar model for long gamma-ray bursts requires a rapidly rotating Wolf-Rayet star as progenitor. We test the idea of producing rapidly rotating Wolf-Rayet stars in massive close binaries through mass accretion and consecutive quasi-chemically homogeneous evolution; the latter had previously been shown to provide collapsars below a certain metallicity threshold for single stars. The binary channel presented here may provide a means for massive stars to obtain the high rotation rates required to evolve quasi-chemically homogeneous and fulfill the collapsar scenario. Moreover, it suggests that a possibly large fraction of long gamma-ray bursts occurs in runaway stars.

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