The chemical inhomogeneity of M22

Details The chemical inhomogeneity of M22 The chemical inhomogeneity of M22

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..130n&link_type=abstract

Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 130-143.

Astronomy and Astrophysics

Astrophysics

66

Abundance, Cosmochemistry, Globular Clusters, Red Giant Stars, Stellar Spectrophotometry, Calcium, Cyanogen, Heavy Elements, Radial Velocity, Stellar Color, Stellar Magnitude

Scientific paper

The suggestion of Hesser, Hartwick, and McClure (1977) that M22 exhibits the anomalous abundance patterns of Omega Centauri is presently confirmed by a spectroscopic survey of CH, CN, and Ca behavior in about 100 of M22's red giants. A direct correlation is noted between the variation of cyanogen and that of Ca II H and K, in keeping with what has been reported for Omega Cen. In addition, a large range in G band strength directly correlates with the Ca and cyanogen variations, C is overabundant relative to the heavy elements in a relatively high proportion of the stars in M22, and the behavior of C sets M22 and Omega Cen apart from the more normal clusters in such a way as to complicate and interpretation of CN variations. These results suggest the need for an additional C enrichment source in M22 and Omega Cen

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