Cantiello 2007 双星作为伽玛暴长暴的起源

主要内容:
作为伽玛暴的前身星，要求有很高的自旋。如果是双星的话，可以比较容易地满足。

精彩摘抄:


文章信息:

arXiv:0709.0829 [ps, pdf, other]

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

Authors: M.Cantiello, S.-C.Yoon, N.Langer, M.Livio

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

Subjects: Astrophysics (astro-ph)

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.