Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nson.book.....k&link_type=abstract
N-body simulations on the numerical determination of the dissolution times of open star clusters in the Galactic tidal field., b
Astronomy and Astrophysics
Astronomy
Scientific paper
The dissolution times of open star clusters with N = 100 to 1000 members with and without a mass-spectrum have been determined by direct N-body simulations, following the evolution of the cluster until total dissolution, using Aarseth's NBODY5 code. Initial conditions were Plummer models with different initial radii. The models were either isolated or embedded into the Galactic tidal field. The results show a good agreement with the prediction for the dissolution time by Wielen (AAA 45.151.072) for medium and large clusters in the tidal field. Clusters with small initial radii or isolated models do not agree with the prediction. The number of stars remaining in an isolated model decreases exponentially with time. In the isolated case the formation of hard binaries absorbs energy from the cluster. The dynamical evolution slows down because the half mass radius and the crossing time of the cluster are increasing.
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