The evolution of massive close binary systems with mass loss and overshooting. I - Mass transfer in systems with initial masses of 20 + 10-solar mass

Details The evolution of massive close binary systems with mass loss and overshooting. I - Mass transfer in systems with initial masses of 20 + 10-solar mass The evolution of massive close binary systems with mass loss and overshooting. I - Mass transfer in systems with initial masses of 20 + 10-solar mass

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..171s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. 171-180.

Astronomy and Astrophysics

Astrophysics

25

Binary Stars, Stellar Evolution, Stellar Mass Ejection, Hertzsprung-Russell Diagram, Mass Transfer, Stellar Cores, Stellar Winds, Wolf-Rayet Stars

Scientific paper

A study is made of the different mass-transfer phases encountered in the evolution of a system of a 20-solar mass primary with an initial mass ratio of 0.5. Evolutionary sequences are calculated, including the effects of mass loss and overshooting from the convective core for different initial periods, all of them resulting in a case A of mass transfer. All the sequences evolve through both a case A and a case B of mass transfer and end up as Wolf-Rayet binaries of varying periods and mass ratios. It is found that initial periods smaller than 3 days result in a contact system being formed during the initial mass-transfer phase. It is shown that short-period WR binaries with large mass ratios can be formed without having to assume that mass is lost from the system. Semiconvection is found to be of no importance in the evolution of the primary as well as in the evolution of the mass accreting, secondary.

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