Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..729t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, Aug. 15, 1984, p. 729-757.
Astronomy and Astrophysics
Astronomy
175
Celestial Mechanics, Chandrasekhar Equation, Friction Drag, Galactic Evolution, Gravitational Effects, Star Clusters, Stellar Systems, Angular Velocity, Astronomical Models, Capture Effect, Orbit Decay, Resonance, Spheres, Stellar Motions
Scientific paper
The authors investigate dynamical friction on a test object (such as a bar or satellite) which rotates or revolves through a spherical stellar system. They find that frictional effects arise entirely from near-resonant stars and they derive an analog to Chandrasekhar's dynamical friction formula which applies to spherical systems. The authors show that a formula of this type is valid so long as the angular speed of the test object changes sufficiently rapidly. If the angular speed is slowly changing two new effects appear: a reversible dynamical feedback which can stabilize or destabilize the rotation speed, and permanent capture of near-resonant stars into librating orbits. The authors discuss orbital decay of satellites in the light of these results.
Tremaine Scott
Weinberg Martin D.
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