The evolution of massive close binaries |
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| Authors: | J -P de Grève C de Loore W Sutantyo |
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| Institution: | 1. Astrophysical Institute, Vrije Universiteit Brussel, Belgium
2. Astronomical Institute, University of Amsterdam, The Netherlands
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| Abstract: | The influence of tidal, interaction on the periods of massive X-ray binaries during the postsupernova evolution is investigated. It is assumed that after a certain time the orbit has become circular and synchronous. The tidal effects of subsequent evolutionary changes in the moment of inertia of the massive component are calculated. It is shown that, as is already suggested by Sparks and Stecher (1974), for small mass ratios and short binary periods a tidal instability may occur resulting in an accelerating inward spiral motion. Before the onset of the instability the tidal forces maintain a nearly synchronous orbit. Possibly the orbits of Cen X-3 and 3 U 1700-37 are already unstable at present. |
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