Calcium abundances in giant stars of the globular clusters M3, M13, M15, and M92

Details Calcium abundances in giant stars of the globular clusters M3, M13, M15, and M92 Calcium abundances in giant stars of the globular clusters M3, M13, M15, and M92

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..408s&link_type=abstract

Astronomical Journal, vol. 85, Apr. 1980, p. 408-414.

Astronomy and Astrophysics

Astronomy

59

Abundance, Calcium, Giant Stars, Globular Clusters, Line Spectra, Stellar Spectra, H Lines, K Lines, Rayleigh Scattering

Scientific paper

The average calcium II H and K line strengths of giant stars in M3, Ml 3, Ml 5, and M92 are found to be closely correlated with the [Fe/H] of the cluster. Simple physical arguments are provided to show the observed average line strengths reproduce the difference in [Fe/H] between the clusters. The observed dispersion in H and K line strengths yields an upper limit of 0.15 dex for M 15 and M92, and 0.11 dex for M3 + M 13 for the average intracluster variation of [Ca/H], provided [Ca/H] = [Fe/H]. The dispersions drop to half these values if the calcium abundance varies independently of the iron peak abundances.

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