Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..301l&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 685, p. 301-307.
Astronomy and Astrophysics
Astronomy
173
Abundance, Giant Stars, Globular Clusters, Oxygen, Sodium, Cyano Compounds, Magnesium, Neon, Stellar Evolution, Stellar Mass
Scientific paper
We explore and extend the suggestion that Na-23 might be produced in the interior of an evolving low-mass globular-cluster giant and mixed to the surface. The reaction rates alone show that sodium will be produced by proton captures on Ne-22 in the region of a globular-cluster giant in which oxygen is being depleted. A more detailed calculation shows that significant amounts of the much more abundant Ne-20 can be transformed into Na-23 on somewhat longer time scales. Atmospheric oxygen depletions that are the result of very deep mixing are bound to be accompanied by sodium enhancements due to Ne-22 (p,gamma) Na-23 reactions; they are quite likely to be accompanied by larger sodium enhancements that begin with proton captures on Ne-20. One cannot argue that a Na-O anticorrelation is strong evidence for a primordial account of the observed variations in O and Na.
Hoffman Robert
Langer Edward G.
Sneden Chistopher
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