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The pollution of the interstellar medium from AGB stars in Globular Clusters

Published online by Cambridge University Press:  05 March 2015

Paolo Ventura
Affiliation:
INAF - Osservatorio Astronomico di Roma Via Frascati 33, 00040, Monte Porzio Catone (RM), Italy email: paolo.ventura@oa-roma.inaf.it
Roberta Carini
Affiliation:
INAF - Osservatorio Astronomico di Roma Via Frascati 33, 00040, Monte Porzio Catone (RM), Italy email: paolo.ventura@oa-roma.inaf.it Universitá di Roma “La Sapienza”Piazzale Aldo Moro 5, 00135 Rome, Italy email: roberta.carini@oa-roma.inaf.it
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Abstract

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We discuss the yields from Asymptotic Giant Branch stars, depending on their mass and metallicity. In agreement with previous investigations, we find that the extent of Hot Bottom Burning increases with mass. The yields of models with chemistry typical of high–metallicity Globular Clusters, i.e. Z = 0.008, show only a modest depletion of magnesium, and an oxgen depletion of ~ 0.4 dex. Low–metallicity yields show a much stronger magnesium depletion, and a dramatic drop in the oxygen content, ~ 1.2dex smaller than the initial value. We suggest that the Globular Cluster NGC 2419 is a possible target to the hypothesis of the self–enrichment scenario of Globular Clusters by the winds of Asymptotic Giant Branch stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

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