Other
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..698c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 15, 1986, p. 698-713.
Other
33
Abundance, Giant Stars, Globular Clusters, Late Stars, Metallicity, Stellar Evolution, Carbon, Line Spectra, Molecular Spectra, Nitrogen, Oxygen
Scientific paper
Indices measuring the strength of CH, C2, CN, and NH bands and Ca II and Ca I lines have been determined for 72 stars in Omega Cen. These data, and narrow-band photometry of the 2.4-micron CO bands, are calibrated by using theoretical indices derived from synthetic spectra which are computed via a grid of model atmospheres of appropriate parameters. In addition to the four C stars, two groups of giants are found in Omega Cen. Both groups include stars spanning a wide range of abundances of the heavy elements, Z. The N-enhanced stars have N/Z enhanced by a factor of 5 to 15, while both C/Z and O/Z are depleted by a factor which may be as much as 10. This depletion allows the CH and CO features to be fitted satisfactorily and yields enough nitrogen to fit CN and NH features. The N-normal stars have N/Z and C/Z within factor of 2 of solar. The range of variation of C and N is typical of those seen in other globular clusters.
Bell Roger A.
Cohen Judith Gamora
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