Statistics – Computation
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..856t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 856-861.
Statistics
Computation
113
Binary Stars, Computational Astrophysics, Early Stars, Stellar Interiors, Stellar Motions, Synchronism, Axes Of Rotation, Meridional Flow, Orbital Elements, Spin Reduction
Scientific paper
A hydrodynamical mechanism is described that provides a simple, natural explanation to the general trend toward synchronism in the components of early-type binaries. Because the tidal interaction with a companion destoys the axial symmetry with respect to the rotation axis, concomitant azimuthal variations in the rotational velocity produce an Ekman-type boundary layer as long as the component does not rotate in synchronism with its orbital motion. This surface boundary layer acts as a sink or source of matter and, hence, exchanges angular momentum with the largely inviscid interior of the radiative envelope. Consequently, large-scale, mechanically driven currents come into existence, and an inexorable spin-down of the tidally distorted star ensues. These transient currents, which are much faster than the steady, thermally driven Eddington-Vogt currents, cease to exist as soon as synchronization has been achieved in the star.
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