The Rate of Internal Energy Increase of a Star Cluster Caused by the Tidal Attraction of the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The gain of internal energy of a star cluster caused by the tidal attraction of our Galaxy is examined. Expressions are derived which include the effects of a two-body orbit and internal motions of the cluster. These formulae are compared with previous results based on (i) uniform rectilinear motion and (ii) neglect of internal motions induced by cluster gravitation(i.e., impulsive approximation), and it is found that these simplifying assumptions generally introduce significant uncertainties.

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