The combined effect of mass loss and overshooting. IV - Mass transfer in massive close binaries

Statistics – Computation

Scientific paper

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Binary Stars, Computational Astrophysics, Hertzsprung-Russell Diagram, Stellar Evolution, Stellar Mass Ejection, Stellar Structure, Branching (Mathematics), Convection, Mass To Light Ratios, Stellar Composition, Stellar Cores, Stellar Winds, Wolf-Rayet Stars

Scientific paper

The bifurcation periods between different cases of mass transfer in massive close binaries are determined, taking into account mass loss and overshooting. Evolutionary computations are presented for 12-20-solar mass primaries, evolving through Case B of mass transfer. It is shown that a remnant after Case B with a given mass originates from a lower initial mass when overshooting is taken into account. The evolution of 20 and 40-solar mass primaries through Case A of mass transfer is presented. After core hydrogen exhaustion, the remnants after Case A of the 20-solar mass models evolve through Case B of mass transfer. The conditions for contact in the systems investigated are also discussed.

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