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Wind anisotropies and GRB progenitors | | Georges Meynet
; Andre Maeder
; | | Date: |
17 Jan 2007 | | Abstract: | We study the effect of wind anisotropies on the stellar evolution leading to collapsars. Rotating models of a 60 M$_odot$ star with $Omega/Omega_{
m crit}=0.75$ 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. | | Source: | arXiv, astro-ph/0701494 | | Services: | Forum | Review | PDF | Favorites | |
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