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2008MNRAS.391..825D - Mon. Not. R. Astron. Soc., 391, 825-843 (2008/December-1)
Formation and dynamical evolution of multiple stellar generations in globular clusters.
D'ERCOLE A., VESPERINI E., D'ANTONA F., McMILLAN S.L.W. and RECCHI S.
Abstract (from CDS):
By means of N-body simulations, we then study the two-population cluster dynamical evolution and mass loss. In our simulations, a large fraction of FG stars are lost early in the cluster evolution due to the expansion and stripping of the cluster outer layers resulting from early mass loss associated with FG supernova (SN) ejecta. The SG population, initially concentrated in the innermost cluster regions, is largely unscathed by this early mass loss, and this early evolution leads to values of the number ratio of SG to FG stars consistent with observations. We also demonstrate possible evolutionary routes leading to the loss of most of the FG population, leaving an SG-dominated cluster. As the cluster evolves and the two populations mix, the local ratio of SG to FG stars, initially a decreasing function of radius, tends to a constant value in the inner parts of the cluster. Until mixing is complete, the radial profile of this number ratio is characterized by a flat inner part and a declining portion in the outer cluster regions.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): hydrodynamics - methods: {em N}-body simulations - stars: chemically peculiar - globular clusters: general
Simbad objects: 10
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