Thermal Timescale Mass Transfer Rates in Intermediate-Mass X-ray Binaries

Details Thermal Timescale Mass Transfer Rates in Intermediate-Mass X-ray Binaries Thermal Timescale Mass Transfer Rates in Intermediate-Mass X-ray Binaries

2007-08-06

arxiv.org/abs/0708.0696v1

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures, and 2 tables, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20077637

Thermal timescale mass transfer generally occurs in close binaries where the donor star is more massive than the accreting star. The mass transfer rates are usually estimated in terms of the Kelvin-Helmholtz timescale of the donor star. But recent investigations indicate that this method may overestimate the real mass transfer rates in accreting white dwarf or neutron star binary systems. We have systematically investigated the thermal-timescale mass transfer processes in intermediate-mass X-ray binaries, by calculating binary evolution sequences with various initial donor masses and orbital periods. From the calculated results we find that on average the mass transfer rates are lower than traditional estimates by a factor of $\sim 4$.

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