Chemical composition of stars in globular clusters: M5, M13, and M3

Details Chemical composition of stars in globular clusters: M5, M13, and M3 Chemical composition of stars in globular clusters: M5, M13, and M3

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..508p&link_type=abstract

Astrophysical Journal, Part 1, vol. 236, Mar. 1, 1980, p. 508-521.

Astronomy and Astrophysics

Astrophysics

77

Abundance, Chemical Composition, Giant Stars, Globular Clusters, Late Stars, Stellar Structure, Atmospheric Models, Iron, Oxygen, Stellar Atmospheres, Stellar Evolution, Stellar Spectra

Scientific paper

The composition of giant stars in the globular clusters M3, M5, and M13 have been determined by detailed model atmosphere analysis; the average iron deficiencies relative to the sun are -1.55, -1.33, and -1.42, respectively. Oxygen is overabundant relative to iron in M3 and M5 but not in M13. Differences in the oxygen abundance can account for variation in horizontal-branch morphology; clusters of intermediate metallicity with high oxygen have red horizontal-branch stars, and those with low oxygen have only blue horizontal-branch stars. Z(CNO) is the second abundance parameter.

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