Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374l..59k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 374, June 20, 1991, p. L59, L60.
Astronomy and Astrophysics
Astrophysics
5
Dwarf Stars, Magnetic Stars, Stellar Mass Accretion, Binary Stars, Stellar Mass Ejection, Stellar Rotation
Scientific paper
schmidt and Stockman (1991) have discovered that V1500 Cygni (Nova Cygni 1975) resembles an AM Herculis star, but with the degenerate dwarf rotating 1.8 percent faster than synchronously, and relaxing toward synchronism on a time scale of less than 200 yr. The inferred spin-down torque is unexpectedly large. It is suggested that this torque results from the interaction of the degenerate star's magnetosphere with a radiation-driven wind from the secondary, and a rapid decay of the spin-down torque, which will soon be observable is predicted. Analogous hydrodynamic torques may also phase-lock the synchronous AM Herculis stars. Study of these systems may help understand torques on neutron stars.
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