Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..487h&link_type=abstract
Astronomy and Astrophysics, v.313, p.487-496
Astronomy and Astrophysics
Astrophysics
2
Stars, Binaries, Close
Scientific paper
Stationary models of contact binaries are presented in which these objects are treated as being dissipative systems. Particular attention is paid to the dissipation accompanying the upward motion of highly buoyant elements within the secondary component. This high buoyancy is due to the fact that such elements (interlopers) have come over from the primary. The hydrodynamical requirement is introduced that these buoyant elements shall penetrate to the maximum height which is thermodynamically permissible. Since a greater (upward) penetration leads to greater friction, the surface properties of the system must so adjust as to permit an overall energy and entropy balance. Thus the tendency of the buoyancy forces to impel material upwards brings a temperature-regulation mechanism into operation. It is found that this mechanism causes the surface temperatures of the components to acquire near-equality. The possible influence on this result of a) dark areas on the primary and b) flaring processes (Linnell's theory) is investigated.
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