Meynet 2007 伽玛暴前身星的星风各向异性

主要内容:


精彩摘抄:


文章信息:

astro-ph/0701494 [abs, ps, pdf, other] :

Title: Wind anisotropies and GRB progenitors
Authors: Georges Meynet, Andre Maeder
Comments: 5 pages, 4 figures, accepted for publication in A&A Letter

We study the effect of wind anisotropies on the stellar evolution leading to collapsars. Rotating models of a 60 M$_\odot$ star with $\Omega/\Omega_{\rm crit}=0.75$ on the ZAMS, accounting for shellular rotation and a magnetic field, with and without wind anisotropies, are computed at $Z$=0.002 until the end of the core He-burning phase. Only the models accounting for the effects of the wind anisotropies retain enough angular momentum in their core to produce a Gamma Ray Burst (GRB). The chemical composition is such that a type Ic supernova event occurs. Wind anisotropies appear to be a key physical ingredient in the scenario leading to long GRBs.