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2010MNRAS.407..854D - Mon. Not. R. Astron. Soc., 407, 854-869 (2010/September-2)
Abundance patterns of multiple populations in globular clusters: a chemical evolution model based on yields from AGB ejecta.
D'ERCOLE A., D'ANTONA F., VENTURA P., VESPERINI E. and McMILLAN S.L.W.
Abstract (from CDS):
We carry out a survey of models and explore the dependence of the final SG chemical properties on the key parameters affecting the gas dynamics and the SG formation process. Finally, we use our chemical evolution framework to build specific models for NGC 2808 and M4, two Galactic globular clusters which show different patterns in the Na-O and Mg-Al anticorrelation and have different helium distributions. We find that the amount of pristine gas involved in the formation of SG stars is a key parameter to fit the observed O-Na and Mg-Al patterns. The HDF for these models is in general good agreement with the observed one. Our models, by shedding light on the role of different parameters and their interplay in determining the final SG chemical properties, illustrate the basic ingredients, constraints and problems encountered in this self-enrichment scenario which must be addressed by more sophisticated chemical and hydrodynamic simulations.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): stars: chemically peculiar - globular clusters: general - globular clusters: individual: NGC 2808 - globular clusters: individual: NGC 6121 - globular clusters: individual: M4
Simbad objects: 12
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