Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999tjph...23..313v&link_type=abstract
Turk. J. Phys., Vol. 23, No. 2, p. 313 - 320
Other
Close Binaries: Angular Momentum, Close Binaries: Stellar Rotation, Close Binaries: Stellar Winds, Close Binaries: Orbital Evolution
Scientific paper
Two groups of late-type very close main sequence binaries, the so-called short period RS CVn and W UMa systems, are important for the understanding of the structure and evolutionary consequences of angular momentum loss (AML) resulting from magnetic stellar winds of fast rotating solar type stars. The components of RS CVn stars are close to their Roche lobes, but still detached, whereas W UMa binaries are contact systems; both are rotating fast. One of the crucial problems is trying to answer the question if there is a dynamical relation between the two types of binaries in the sense that, as a consequence of the AML, the orbit of the detached sytems will shrink, so that both components come in contact and produce a W UMa type binary. The author discusses the relation between wind and starspots and the dependance of AML on the latitude of these spots. No obvious conclusion is possible concerning the shrinking of the orbit of RS CVn binaries. He shows that other possibilities for orbits of detached systems with magnetic activity also exist.
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