The Time Scale of Escape from Star Clusters

Details The Time Scale of Escape from Star Clusters The Time Scale of Escape from Star Clusters

1999-10-26

arxiv.org/abs/astro-ph/9910468v1

Mon.Not.Roy.Astron.Soc. 318 (2000) 753

Astronomy and Astrophysics

Astrophysics

15 pages, 11 figures, plain TeX, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03811.x

In this paper a cluster is modelled as a smooth potential (due to the cluster stars) plus the steady tidal field of the Galaxy. In this model there is a minimum energy below which stars cannot escape. Above this energy, however, the time scale on which stars escape varies with the orbital parameters of the star (mainly its energy) in a way which we attempt to quantify, with both theoretical arguments and computer simulations. Within the limitations of the model we show that the time scale is long enough to complicate the interpretation of full N-body simulations of clusters, and that stars above the escape energy may remain bound to the cluster for about a Hubble time.

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