Core-Collapse Times of Two-Component Clusters

Abstract

We examine the corecollapse times of isolated, two-mass-component star clusters using Fokker-Planck models. With initial condition of Plummer models, we find that the corecollapse times of clusters with M1/M2 >> 1 are well correlated with (N1/N2)1/2(m1/m2)2 trh, where M1/M2 and m1/m2 are the light to heavy component total and individual mass ratios, respectively, N1/N2 is the number ratio, and trh is the initial half-mass relaxation time scale. We also find two-component cluster parameters that best match multi-component (thus more realistic) clusters with power-law mass functions.

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