The self-enrichment scenario in intermediate metallicity globular clusters

被引：0
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作者：
Ventura, P. [1 ]
D'Antona, F. [1 ]
机构：
[1] INAF, Observatory of Rome, via Frascati 33, 00040 MontePorzio Catone (RM), Italy
来源：
Astronomy and Astrophysics | 2008年 / 479卷 / 03期
关键词：
Context: We present stellar yields computed from detailed models of intermediate mass asymptotic giant branch stars of low metallicity. In this work; all the main microphysics inputs have been updated; and in particular α-enhancement is explicitly taken into account in both the opacities and equation of state.Aims: The target of this work is to provide a basis for testing the reliability of the AGB self-enrichment scenario for globular clusters of intermediate metallicity. These globular clusters exhibit well-defined abundance patterns; which have often been interpreted as the consequence of the pollution of the interstellar medium by the ejecta of massive AGBs. Methods: We calculated a grid of intermediate-mass models with metallicity; the evolutionary sequences are followed from the pre-main sequence throughout the whole AGB phase. We focus our attention on those elements widely studied in the spectroscopic investigations of globular clusters stars; i.e; oxygen; sodium; aluminium; magnesium; and fluorine. Results: The predictions of our models show an encouraging agreement with the demand of the self-enrichment scenario for what concerns the abundances of oxygen; fluorine; and magnesium. The question of sodium is more tricky; due to the large uncertainties of the cross-sections of the Ne-Na cycle. The present results show that only a relatively narrow range of initial masses ( ) can be responsible for the self enrichment.. © 2008 ESO;
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页码：805 / 816
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