Lithium and proton-capture elements in globular cluster dwarfs: The case of 47 TUC

Valentina D'Orazi*, Sara Lucatello, Raffaele Gratton, Angela Bragaglia, Eugenio Carretta, Zhixia Shen, Simone Zaggia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Previous surveys in a few metal-poor globular clusters (GCs) showed that the determination of abundances for Li and proton-capture elements offers a key tool to address the intracluster pollution scenario. In this Letter, we present Na, O, and Li abundances in a large sample of dwarf stars in the metal-rich GC 47 Tucanae. We found a clear Na-O anticorrelation, in good agreement with what obtained for giant members by Carretta et al. While lithium and oxygen abundances appear to be positively correlated with each other, there is a large scatter, well exceeding observational errors, and no anticorrelation with sodium. These findings suggest that Li depletion, due to mechanisms internal to the stars (which are cooler and more metal-rich than those on the Spite plateau), combines with the usual pollution scenario responsible for the Na-O anticorrelation.

Original languageEnglish
Pages (from-to)L1-L5
Number of pages5
JournalAstrophysical Journal Letters
Volume713
Issue number1 PART 2
DOIs
Publication statusPublished - 2010
Externally publishedYes

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