Masses and the evolution of Wolf-Rayet binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, O Stars, Stellar Evolution, Stellar Mass, Wolf-Rayet Stars, Astronomical Models, Mass Transfer, Stellar Envelopes, Stellar Spectrophotometry, Stellar Winds

Scientific paper

Recent polarimetric observations have provided inclinations of double-line spectroscopic binary systems containing Wolf-Rayet stars with O star companions. Therefore, reasonably accurate masses of ten Wolf-Rayet stars in binaries are now known. These data are compared to evolutionary models of massive close binaries based on the scenario that O + O systems evolve into WR + O systems. Good agreement is found between the observations and nonconservative binary models with classical cores for the observed range of contemporary masses. The models with large convective-core overshooting fail to describe systems with Wolf-Rayet stars having observed masses larger than about 10 solar masses.

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