Journal Article

Dynamical friction for compound bodies

R. Domínguez-Tenreiro and M. A. Gómez-Flechoso

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 3, pages 465-477
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01224.x
Dynamical friction for compound bodies

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Abstract

In the framework of the fluctuation—dissipation approach to dynamical friction, we derive an expression giving the orbital energy exchange experienced by a compound body, as it moves, interacting with a non-homogeneous discrete background. The body is assumed to be composed of particles endowed with a velocity spectrum and with a non-homogeneous spatial distribution. The Chandrasekhar formula is recovered in the limit of a point-like satellite with zero velocity dispersion and infinite temperature moving through a homogeneous infinite medium. In this same limit, but dropping the zero satellite velocity dispersion (σS) condition, the orbital energy loss is found to be smaller than in the σS=0 case by a factor of up to an order of magnitude in some situations.

Keywords: methods: analytical; celestial mechanics, stellar dynamics

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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