Computer Science – Numerical Analysis
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..45..105a&link_type=abstract
Astrophysics and Space Science, vol. 45, Nov. 1976, p. 105-117.
Computer Science
Numerical Analysis
3
Binary Stars, Nutation, Precession, Stellar Models, X Ray Astronomy, X Ray Sources, Equations Of Motion, Moments Of Inertia, Numerical Analysis, Potential Fields
Scientific paper
The precession of the orbital plane in a close binary system can provide an important observational tool for investigating dynamical properties of the components. Tidal evolution will always tend to align the rotation axes perpendicular to the orbital plane, thereby eliminating precession. It is pointed out, however, that if observations indicate the existence of a circular orbit and synchronous rotation of the components - which is the outcome of tidal evolution - then precession may still be present, provided the interior of one of the components is, or recently has been, radiative and is not strongly coupled to the surface layers (where tidal dissipation is greatest). The equations governing precession and nutation are derived in a concise form and applied to the numerical study of two binary systems. The observational effects are also discussed. Finally, it is pointed out that precession may be present in a subclass of the X-ray binary systems, and its observational significance is briefly discussed.
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