Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211...83c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 1, 1984, p. 83-95.
Other
12
Binary Stars, Cataclysmic Variables, Magnetic Stars, Mass Transfer, Stellar Mass, White Dwarf Stars, Angular Momentum, Stellar Mass Accretion, Torque
Scientific paper
Magnetically controlled mass transfer is considered in an AM Herculis-type binary. An expression is derived for the accretion torque on the primary star for the case in which its magnetic moment lies in the orbital plane. Stable orientations are found at which this torque vanishes. Other orientations are found which may restrict mass transfer, and a possible connection with the low states observed in these systems is discussed. An expression can be derived for the accretion torque on an asynchronous primary as a function of time, provided that the degree of asynchronism is not too large. The average of this torque over a synodic rotation period of the primary gives the same expression as that derived by assuming that the specific angular momentum of material is conserved in an inertial frame centred on the star, despite the fact that this is not the case for the flow along an instantaneous path.
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