Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 713, Issue 1, Pages L1-L5Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/713/1/L1
Keywords
globular clusters: individual (NGC 104); stars: abundances; stars: individual (Population II)
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Funding
- PRIN INAF 2007
- DFG
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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.
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