Late stages in the evolution of open star clusters

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Binary Stars, Galactic Evolution, Open Clusters, Stellar Evolution, Cosmic Dust, Star Distribution, Statistical Analysis, Stellar Motions

Scientific paper

Results of Hills' (1975) numerical experiment on binary-star interactions with single stars in open clusters are used to formulate and solve equations for the dynamic evolution of such star clusters. It is shown that open star clusters evolve in a nonclassical way at late stages and that cluster evolution may proceed via contraction, stabilization, or expansion. The results obtained also indicate that the presence of galactic gas-dust clouds and binary stars significantly increases the value of the minimum critical star density in open clusters.

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