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THE SODIUM/ALUMINUM-OXYGEN ANTICORRELATION IN ω CENTAURI AND OTHER CLUSTERS

机译:ωCENTAURI和其他簇中的钠/铝-氧反相关

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摘要

We discuss abundances of O, Na, and Al, as a function of [Fe/H], together with their interrelationships, from a high-dispersion, high signal-to-noise analysis of a (biased) sample of 40 red giants in the chemically inhomogeneous cluster ω Centauri. Accompanying the well-established range in [Fe/H], which in our sample extends from —1.8 to —0.8, we find large variations of O, Na, and Al. At [Fe/H] ~ —1.5, for example, Δ[O/ Fe] ≥ 0.9, Δ[Na/Fe] ~ 0.6, and Δ[Al/Fe] ~ 1.1. More important, there are strong ([Na/Fe], [O/Fe]) and ([Al/Fe], [O/Fe]) anticorrelations, and a strong positive correlation between [Na/Fe] and [Al/Fe]. The simplest explanation of these relationships is that they are produced by evolutionary mixing effects as suggested by Denisenkov & Denisenkova in the context of earlier observations of this cluster and elaborated upon by Langer, Hoffman, & Sneden for more normal ones. We comment on the importance of the relative sizes of the ranges of intracluster Na and Al variations as a possible diagnostic of putative mixing phenomena.
机译:我们讨论了[Fe / H]与O,Na和Al的丰度,以及它们之间的相互关系,这是通过对(偏向)40个红色巨星样品(偏向)的高分散,高信噪比分析得出的化学上不均匀的簇ωCentauri。伴随[Fe / H]的既定范围(在我们的样本中范围从-1.8到-0.8),我们发现O,Na和Al的变化很大。例如,在[Fe / H]〜-1.5时,Δ[O / Fe]≥0.9,Δ[Na / Fe]〜0.6,Δ[Al / Fe]〜1.1。更重要的是,存在强烈的[[Na / Fe],[O / Fe])和([Al / Fe],[O / Fe])反相关,并且[Na / Fe]和[Al /铁]。对这些关系的最简单的解释是,它们是由Denisenkov和Denisenkova在较早的对该簇的观测的背景下提出的,由进化混合效应产生的,而Langer,Hoffman和Sneden则对更正常的现象进行了阐述。我们评论簇内Na和Al变异范围的相对大小的重要性,以作为可能的混合现象的诊断依据。

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