Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ssrv...50..165e&link_type=abstract
(IAU, NSERC, Canadian Institute of Theoretical Astrophysics, et al., Colloquium on Algols, 107th, Sidney, Canada, Aug. 15-19, 19
Astronomy and Astrophysics
Astrophysics
13
Binary Stars, Cataclysmic Variables, Red Giant Stars, Stellar Envelopes, Stellar Evolution, B Stars, Companion Stars
Scientific paper
Evolutionary processes in binaries where the primary becomes a red giant with a deep convective envelope before it fills its Roche lobe are discussed. Sucn binaries (late Case B or late Case C, if they evolve conservatively) ought to suffer drastic mass transfer, on a hydrodynamic timescale. In some circumstances this may lead to a common envelope, spiral-in, and finally either a very short-period binary or coalescence. But there appear to be other circumstances in which the outcome is an ordinary Algol, or a wide binary with a white dwarf companion as in Barium stars and some symbiotics. An attempt is made to demonstrate that stellar-wind mass loss, enhanced one or two orders of magnitude by tidal interaction with a companion, can vitally affect the approach to Roche lobe overflow (RLOF), and indeed may prevent RLOF in binaries with periods over 1000 d.
Eggleton Peter P.
Tout Christopher A.
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