Journal
ASTRONOMY & ASTROPHYSICS
Volume 464, Issue 2, Pages L11-L15Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20066509
Keywords
stars : evolution; stars : rotation; stars : magnetic fields; gamma rays : bursts
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Aims. We study the effect of wind anisotropies on the stellar evolution leading to collapsars. Methods. Rotating models of a 60 M-circle dot star with Omega/Omega(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. Results. 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. Conclusions. Wind anisotropies appear to be a key physical ingredient in the scenario leading to long GRBs.
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