Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211...69c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 1, 1984, p. 69-74.
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Cataclysmic Variables, Magnetic Stars, Stellar Rotation, White Dwarf Stars, Stellar Mass Accretion, Synchronism
Scientific paper
The spin evolution of the magnetic primary stars in the 10 known AM Herculis binaries is investigated, using the theory formulated in Campbell (1984). It is found that, in all cases, magnetic dissipation in the convective secondary can synchronize the primary if it operated before mass transfer began, provided that the initial degree of asynchronism is not excessively large. This dissipation mechanism can also explain a small degree of asynchronism of the primary if accretion began before synchronization was achieved, or if accretion broke a previously attained synchronous state. This slightly asynchronous state exists provided that the mass of the primary is not appreciably greater than 0.8 solar masses. However, this state may exist for higher primary masses if the accreting magnetic pole lies out of the orbital plane.
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