The ultimate fate of Wolf-Rayet stars as supernovae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stellar Evolution, Stellar Mass Ejection, Supernovae, Wolf-Rayet Stars, Stellar Models, Stellar Structure

Scientific paper

The evolution of stars more massive than nine solar masses is similar for models with mass loss at the observed rates and models of constant mass, indicating that the final outcome of the centers of OB stars is not substantially modified by stellar winds. Most mass-losing OB stars that may after several stages become WR stars are therefore likely to explode as supernovae. A fraction of such stars may, however, end their life as small mass planetary nuclei. Three different determinations are made of the fraction of supernovae originating from WR progenitors. The first estimate is based on the approximately 1200 WR stars in the Galaxy, the second on the supernova remnants, and the third on current mass spectrum and mass limits. The three estimates are consistent and indicate one supernova from a WR progenitor over 3-7 supernova events.

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