Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-30
Astronomy and Astrophysics
Astrophysics
13 pages, 14 figures, added two figures, updated conclusion and discussion, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09631.x
We present new models of the evolution and dissolution of star clusters evolving under the combined influence of internal relaxation and external tidal fields, using the anisotropic gaseous model based on the Fokker-Planck approximation, and a new escaper loss cone model. This model borrows ideas from loss cones of stellar distributions near massive black holes, and describes physical processes related to escaping stars by a simple model based on two timescales and a diffusion process. We compare our results with those of direct $N$-body models and of direct numerical solutions of the orbit-averaged Fokker-Planck equation. For this comparative study we limit ourselves to idealized single point mass star clusters, in order to present a detailed study of the physical processes determining the rate of mass loss, core collapse and other features of the system's evolution. With the positive results of our study the path is now open in the future to use the computationally efficient gaseous models for future studies with more realism (mass spectrum, stellar evolution).
Ernst Arthur
Giersz Mirek
Spurzem Rainer
Takahashi Keitaro
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