Wolf-Rayet stars as gamma-ray burst progenitors

Details Wolf-Rayet stars as gamma-ray burst progenitors Wolf-Rayet stars as gamma-ray burst progenitors

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010newar..54..206l&link_type=abstract

New Astronomy Reviews, Volume 54, Issue 3-6, p. 206-210.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The collapsar scenario for long gamma-ray bursts requires rapidly rotating Wolf-Rayet stars as progenitor stars. We highlight two possible ways out of the dilemma that the strong winds of Wolf-Rayet lead to a fast spin-down. One way is to restrict the duration of the Wolf-Rayet phase to a short time span at the end of the star’s evolution. We show that this appears to apply to GRB 021004. The other way is to choose a sub-solar metallicity, thus limiting the Wolf-Rayet wind efficiency. We discuss corresponding stellar evolution models and show that a metallicity limit of about 1/10th solar, as it is required by the models, may be consistent with the empirical gamma-ray burst rate.

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