Realistic models for evolving globular clusters - Core collapse with a mass spectrum

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Astronomical Models, Galactic Evolution, Globular Clusters, Gravitational Collapse, Mass Spectra, Stellar Models, Brightness, Horizontal Branch Stars, Numerical Integration, Red Giant Stars

Scientific paper

Models for evolving globular clusters are discussed which contain realistic stellar mass spectra generated by direct numerical integration of the Fokker-Planck equation. The heavy nonluminous objects considered are shown to settle to the center of the cluster and to dominate the core within a half-mass relaxation time corresponding to about 3 Gyr for the standard model. The other less massive components are found to have significantly flatter power-law surface density profiles in the core, with the power-law index depending on the individual stellar mass of each mass group. The results support the previous suggestion that the central power-law slopes of several candidate post-collapse clusters are flatter than the value of -1 expected for binary post-collapse expansion in a one-component cluster.

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