Statistics – Computation
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..865a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 865-871.
Statistics
Computation
9
Binary Stars, Magnetic Stars, Stellar Activity, Synchronism, Tides, Computational Astrophysics, Gravitational Fields, Libration, Stellar Rotation, Stellar Winds
Scientific paper
In a recent paper, Applegate and Patterson (1987) proposed that changes in axisymmetric quadrupole deformations through the dynamo cycle was responsible for the orbital period changes seen on decade time scales in V461 Tau and other systems. In this paper, the assumption of axisymmetry is relaxed and the quadrupole deformation is allowed to be triaxial. The torques produced by the magnetic wind, tides, and the triaxiality combine to produce an observable modulation of the orbital period of order weeks to a couple of years. It is argued that in the most likely situation, the wind torque holds the binary out of synchronous rotation by an amount which depends on the wind torque and the tidal synchronization time. In this case, the determination of the wind torque and of the period of the modulation of the orbital period can be combined to produce a direct measurement of the tidal synchronization time.
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