Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l..83t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. L83-L87.
Astronomy and Astrophysics
Astrophysics
9
Binary Stars, Cataclysmic Variables, Dynamic Stability, Gravitational Waves, Mass Transfer, Angular Momentum, Roche Limit, Stellar Luminosity, Stellar Mass, Stellar Winds, White Dwarf Stars
Scientific paper
A dynamical instability in a convective secondary is proposed as an explanation of the period gap of cataclysmic variable systems. It is demonstrated that if, during the course of evolution of the binary system, the secondary component detaches from its Roche lobe when it is fully convective, then at the next onset of mass transfer a dynamical instability may ensue. It is shown that such a system at orbital period near 3 hr will be unstable to mass transfer and that stability will be regained at longer orbital periods when the system becomes detached. If the time scale for orbital decay by angular momentum losses associated with gravitational radiation and/or a magnetically coupled stellar wind is shorter than the Hubble time, the system will then resume mass transfer at periods near 2 hr.
McDermott P. N.
Taam Ronald E.
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