The chemical compositions of stars in the globular cluster 47 Tucanae and the old disk cluster NGC 2420

Details The chemical compositions of stars in the globular cluster 47 Tucanae and the old disk cluster NGC 2420 The chemical compositions of stars in the globular cluster 47 Tucanae and the old disk cluster NGC 2420

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l..21p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Jan. 1, 1980, p. L21-L25.

Astronomy and Astrophysics

Astrophysics

107

Astronomical Photometry, Chemical Composition, Globular Clusters, Metallic Stars, Star Clusters, Abundance, Giant Stars, Iron, Spectral Bands

Scientific paper

The metallicities of the globular cluster 47 Tucanae and the old disk cluster NGC 2420 are redetermined from high-dispersion spectroscopy and from photometry with the Washington system. The mean iron deficiency of 47 Tucanae is -1.2, and oxygen is enriched relative to iron. The photometric data suggest that the CN or CH bands are also enhanced. The iron deficiency of NGC 2420 is approximately -0.7, with no enrichment of oxygen. The impact of these results on the interpretation of globular cluster color-magnitude diagrams, and on theories of galactic chemical evolution, is discussed.

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