Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982baicz..33..302k&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin, vol. 33, no. 5, 1982, p. 302-308.
Astronomy and Astrophysics
Astronomy
6
Accretion Disks, Binary Stars, Stellar Mass Accretion, Stellar Mass Ejection, Angular Momentum, Mass Flow, Stellar Rotation, Viscosity
Scientific paper
Keplerian disks rotating differentially around binary components which are rotating at the critical velocity are considered, and it is shown that the angular momentum can be effectively removed from such a component by an accretion disk encircling it. The gainers in double contact binaries are accordingly able to accept the incoming matter. The accretion disk cannot, however, decrease the velocity of the star's rotation below the critical velocity. When there is no Roche lobe overflow mass transfer, and at least one component is rotating at the critical velocity, an inner excretion disk is built up around it which takes away the central star's mass, angular momentum and rotational energy. It is demonstrated that the radiative flux distribution over the accretion disk surface differs from the distribution corresponding to the excretion disk, so that the two cases should be observationally distinguishable.
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