Rotational Dynamics of Deformable Celestial Bodies. I: Tidal Deformations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The aim of the present paper will be to derive the fundamental equations for rotation about the centre of gravity of a celestial body, consisting of material of arbitrary viscosity, in an external field. Euler's equations for a deformable body are set up in an inertial (or fixed) coordinate system without any restriction on the stress tensor. Application of these equations is made for a simple viscous fluid body. Then, the Eulerian equations are formulated explicitly for three-dimensional rotation of self-gravitating compressible celestial bodies of arbitrary structure, and the viscosity of their material is treated as an arbitrary function of spatial coordinates, with special respect to a description of the effects of tidal deformation in a close pair of such bodies.

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