Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l..81n&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 2, p. L81-L84
Astronomy and Astrophysics
Astrophysics
69
Abundance, Globular Clusters, Nuclear Fusion, Red Giant Stars, Stellar Composition, Aluminum, Correlation, Oxygen, Sodium
Scientific paper
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 omega 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) approximately -1.5, for example, Delta(O/Fe) greater than 0.9, Delta(Na/Fe) approximately 0.6, and Delta(Al/Fe) approximately 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.
Da Costa Gary S.
Norris John. E.
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