Evolution of low-mass close binaries and the problem of orbital period gap in cataclysmic variables

Details Evolution of low-mass close binaries and the problem of orbital period gap in cataclysmic variables Evolution of low-mass close binaries and the problem of orbital period gap in cataclysmic variables

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.103..125f&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 103, no. 1, Aug. 1984, p. 125-135.

Astronomy and Astrophysics

Astrophysics

10

Binary Stars, Cataclysmic Variables, Main Sequence Stars, Orbital Elements, Stellar Evolution, White Dwarf Stars, Angular Momentum, Gravitational Waves, Mass Transfer, Periodic Variations, Stellar Mass, Stellar Winds

Scientific paper

The evolution of a close binary composed of a white dwarf primary and a Main-Sequence secondary has been calculated. Angular-momentum loss via gravitational radiation and magnetic stellar wind have been taken into account. It is found that a magnetic stellar wind with a rate greater than 10 to the -10th to 10 to the -9th solar masses/yr is able to drive the evolution with mass exchange. If the time-scale of switch-off of the wind when the primary becomes fully convective is not longer than about a million yr, mass exchange interrupts due to a contraction of the secondary and the system becomes unobservable. Mass exchange resumes when components approach one another due to loss of momentum via gravitational radiation. The location and width of the thus-arising gap in the orbital periods are comparable to those observed.

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