Escape from a Crisis in Fokker-Planck Models

Details Escape from a Crisis in Fokker-Planck Models Escape from a Crisis in Fokker-Planck Models

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cemda..73..179p&link_type=abstract

Celestial Mechanics and Dynamical Astronomy, v. 73, Issue 1/4, p. 179-186 (1999).

Astronomy and Astrophysics

Astronomy

6

Scientific paper

Recent N-body simulations have shown that there is a serious discrepancy between the results of N-body simulations and the results of Fokker-Planck simulations for the evolution of globular and rich open clusters under the influence of the galactic tidal field. In some cases, the lifetime obtained from Fokker-Planck calculations is more than an order of magnitude smaller than those from N-body simulations. In this paper we show that the principal cause for this discrepancy is an over-simplified treatment of the tidal field used in previous Fokker-Planck simulations. We performed new Fokker-Planck calculations using a more appropriate implementation for the boundary condition of the tidal field. The implementation is only possible with anisotropic Fokker-Planck models, while all previous Fokker-Planck calculations rely on the assumption of isotropy. Our new Fokker-Planck results agree well with N-body results. Comparison of the two types of simulations gives a better understanding of the evolution of such clusters.

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