标题： 球状星团矮星中的锂和质子俘获元素：47 Tuc案例 显示英文标题

标题： Lithium and proton-capture elements in Globular Cluster dwarfs: the case of 47 Tuc

摘要： 以往对少数贫金属球状星团（GCs）的调查表明，确定锂和质子俘获元素的丰度提供了一个关键工具，以探讨星团内的污染情景。 在这篇信中，我们展示了富金属球状星团 47 Tucanae 中大量矮星的钠、氧和锂丰度。 我们发现了一个清晰的钠-氧反相关性，与 Carretta 等人对巨星成员得到的结果一致。 虽然锂和氧丰度似乎彼此正相关，但存在大量的离散性，明显超过观测误差，并且与钠没有反相关性。 这些发现表明，由于恒星内部机制（比位于 Spite 平台上的那些更冷、金属更丰富的恒星）导致的锂耗尽，结合通常负责钠-氧反相关的污染情景。 显示英文摘要

摘要： 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.