Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..293p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 189, Oct. 1979, p. 293-297.
Astronomy and Astrophysics
Astronomy
55
Binary Stars, Mass Transfer, Novae, Orbital Mechanics, Periodic Variations, Stellar Models, Stellar Spectrophotometry, Astronomical Models, Stellar Mass Accretion, Stellar Mass Ejection, Variable Stars
Scientific paper
A model is proposed to explain the observation that the photometric period of certain cataclysmic variables observed during outburst is slightly greater than that observed during quiescence. It is shown that a small eccentricity in dwarf nova-type systems can give rise to periodic mass transfer with a rate dependent on the period with which stellar separation varies, which period would exceed the orbital period by a few percent. The longer period of mass transfer would then be observable during stellar outbursts, when the size of the optical hump which represents the optical flux emitted anisotropically by the bright spot decreases. A mechanism involving accretion-disk tides is suggested to account for the maintenance of the orbital eccentricity of the secondary star. The proposed model is found to be able to account for the photometric behavior of the variables VW Hyi and WZ Sge.
Papaloizou John
Pringle James E.
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