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Lithium and proton-capture elements in globular clusters: the case of 47 Tucanae

Published online by Cambridge University Press:  23 April 2010

Valentina D'Orazi ,
Sara Lucatello ,
Raffaele Gratton ,
Angela Bragaglia  and
Eugenio Carretta
Valentina D'Orazi
Affiliation:
INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122, Padova email: [email protected], [email protected], [email protected]
Sara Lucatello
Affiliation:
INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122, Padova email: [email protected], [email protected], [email protected] Excellence Cluster Universe, Boltzmannstr. 2, D-85748, Garching, Germany
Raffaele Gratton
Affiliation:
INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122, Padova email: [email protected], [email protected], [email protected]
Angela Bragaglia
Affiliation:
INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna email: [email protected]; [email protected]
Eugenio Carretta
Affiliation:
INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna email: [email protected]; [email protected]
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Abstract

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The determination of lithium (Li) abundances in Globular Clusters (GCs), along with proton-capture elements (Na, O, Mg, Al), offer a key tool to address the pollution scenario and its mechanisms, the dilution process acting within each star and the first phases in the lifetime of GCs. We present our results on Na, O and Li abundance determination in a large sample of dwarf stars in the GC 47 Tucanae (NGC 104). While we found a clear Na-O anti-correlation, in perfect agreement with giant members by Carretta et al. (2009a, b), Li abundance appears neither positively correlated with oxygen, nor anti-correlated with sodium. Our finding unveils an intrinsic scatter in Li content, independent of intra-cluster pollution by a first generation of more massive, faster evolving stars.

Keywords

Stars: abundances – Galaxy: globular clusters: individual: 47 Tuc
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 177 - 178
Copyright
Copyright © International Astronomical Union 2010

References

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