Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100l...7v&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. L7-L9. Research supported by the Nederlandse Organisatie voor Zuiver
Astronomy and Astrophysics
Astrophysics
406
Binary Stars, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Rotation, X Ray Binaries, X Ray Sources, Angular Momentum, Gravitational Effects, Gravitational Waves, Magnetic Effects, Main Sequence Stars, Mass Transfer, Spin Reduction, Stellar Temperature, Stellar Winds
Scientific paper
It is pointed out that the cool main-sequence components of cataclysmic binaries and low-mass X-ray binaries will undergo rotational braking by a magnetically coupled stellar wind, in a way similar to single main-sequence stars. Since the low-mass components of close binaries are forced by tidal forces to remain in corotation, this leads to a loss of orbital angular momentum from the system, and to an enhanced mass-transfer rate. Using the empirical braking law for cool main-sequence stars, it is found that in systems with secondary mases equal to, or greater than 0.3 to 0.5 solar masses the induced mass-transfer rate is larger than that produced by gravitational radiation losses. For a secondary mass of 0.8 solar masses, a mass transfer rate of 10 to the -8.5th is achieved, sufficient to power the brightest low mass X-ray binaries.
Verbunt Frank
Zwaan Cornelis
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