Core-Collapse Times of Two-Component Clusters

Original · EN

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.