The Constancy of [alpha/Fe] in Globular Clusters of Differing [Fe/H] and Age

Details The Constancy of [alpha/Fe] in Globular Clusters of Differing [Fe/H] and Age The Constancy of [alpha/Fe] in Globular Clusters of Differing [Fe/H] and Age

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasp..108..900c&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.108, p.900

Astronomy and Astrophysics

Astronomy

155

Stars: Abundances, Globular Clusters: General, Galaxy: Halo

Scientific paper

We review the literature to derive estimates for the abundances of the four "alpha" elements' abundances relative to iron [O/Fe], [Si/Fe], [Ca/Fe], and [Ti/Fe], as a function of [Fe/H] and age, in the globular clusters. Magnesium is under-studied, and is depleted in some metal-poor cluster giants, and hence is not useful for study. While [O/Fe] values within clusters vary, due to mixing of ON cycle material into their photospheres, consideration of only those stars with low sodium abundances, [Na/Fe]

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