Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..731k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 15, 1990, p. 731-737.
Astronomy and Astrophysics
Astronomy
31
Binary Stars, Interstellar Magnetic Fields, Magnetic Dipoles, Stellar Rotation, White Dwarf Stars, Stellar Mass Accretion, Synchronism, Torque
Scientific paper
In AM Herculis systems a synchronizing torque must counter the spin-up effect of the accretion torques and make the white dwarf corotate with the binary. This synchronizing torque is generally considered to involve the interaction between the primary and secondary magnetic dipoles. The accretion and dipole-dipole torques are computed; they show that equilibrium is possible only if the two dipoles lie in the orbital plane. Since accretion is observed to occur on regions lying out of the plane, higher magnetic multipoles probably control the accretion flow near the white dwarf. If the secondary star is rotationally braked (e.g. by magnetic stellar wind braking) the accretion torque is only a small fraction of the maximum possible dipole-dipole torque. If there is no such rotational braking of the secondary, the accretion flow must be comparable with this maximum value.
Frank Jacki
King Andrew R.
Whitehurst Robert
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