The Mass-to-Light Ratios of Galactic Globular Clusters
Abstract
The observed mass-to-light (M/L) ratios of globular clusters (GCs) are on average ~20% lower than expected from Simple Stellar Population (SSP) models, which only account for the effects of stellar evolution. We study the M/L ratio evolution of a sample of 24 Galactic GCs using parameterised cluster models. The dynamical evolution of GCs is included by accounting for their dissolution and by using a detailed description of the evolution of the stellar mass function. The ejection of low-mass stars leads to a decrease of M/L, which is found to explain the discrepancy between the observations and SSP models.
Keywords
Cite
@article{arxiv.0910.4773,
title = {The Mass-to-Light Ratios of Galactic Globular Clusters},
author = {J. M. Diederik Kruijssen and Steffen Mieske},
journal= {arXiv preprint arXiv:0910.4773},
year = {2009}
}
Comments
4 pages, 2 figures. To appear in the proceedings of "Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies" (Tennessee, July 2009)