Wind anisotropies and GRB progenitors

Details Wind anisotropies and GRB progenitors Wind anisotropies and GRB progenitors

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...464l..11m&link_type=abstract

Astronomy and Astrophysics, Volume 464, Issue 2, March III 2007, pp.L11-L15

Astronomy and Astrophysics

Astrophysics

36

Stars: Evolution, Stars: Rotation, Stars: Magnetic Fields, Gamma Rays: Bursts

Scientific paper

Aims:We study the effect of wind anisotropies on the stellar evolution leading to collapsars. Methods: Rotating models of a 60 M_&sun; star with Ω/Ω_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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