The evolution of massive close binary systems with mass loss and overshooting. II - Case A of mass transfer in systems with high mass ratios

Statistics – Computation

Scientific paper

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Binary Stars, Mass Ratios, Stellar Evolution, Stellar Mass Ejection, Computational Astrophysics, Hertzsprung-Russell Diagram, Main Sequence Stars, Mass Transfer, Stellar Winds, Wolf-Rayet Stars

Scientific paper

The case A of mass transfer is studied for systems with an initial primary mass of 20 solar masses with initial mass ratios of 0.8 and 0.9. Simultaneous evolutionary calculations are presented, including the effects of overshooting from the convective core and mass loss through a stellar wind, for different initial periods. Two modes of evolution are found: a sequential mode in which the primary evolves into a WR star before the secondary fills its critical lobe (in this type of evolution, no contact systems are formed during case A of mass transfer) and a parallel mode in which the evolution of the secondary drives it past its own critical radius, resulting in long lived contact or near-contact systems that cannot evolve conservatively. Possible fates of the two modes are discussed.

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