Carbon and nitrogen abundances in giant stars of the metal-poor globular cluster M92

Details Carbon and nitrogen abundances in giant stars of the metal-poor globular cluster M92 Carbon and nitrogen abundances in giant stars of the metal-poor globular cluster M92

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..207c&link_type=abstract

Astrophysical Journal Supplement Series, vol. 49, June 1982, p. 207-258. Research supported by the Swiss National Science Found

Astronomy and Astrophysics

Astrophysics

198

Abundance, Giant Stars, Globular Clusters, Late Stars, Stellar Evolution, Stellar Spectra, Asymptotic Giant Branch Stars, Atomic Spectra, Carbon, Color-Magnitude Diagram, Hyperfine Structure, Image Dissector Tubes, Molecular Spectra, Nitrogen, Nuclear Fusion, Solar Spectra, Stellar Atmospheres, Stellar Models, Stellar Temperature, Ubv Spectra

Scientific paper

The 169 low resolution image tube scanner spectra obtained at the Lick Observatory for 71 stars in the field of M92, covering the 3100-5200 A spectral interval, are matched with synthetically generated spectra to find the C and N abundances for a subset of 45 bright member giants. It is found that (1) stars side by side in the color-magnitude diagram show N and C abundance variations by factors of 10 and three, respectively, (2) the segregation of stars into small groups by effective temperature and log g shows no inversely proportional relationship between N and C abundance, and (3) the mean C abundance is 10 times smaller on the AGB than on the SGB. The C and N abundances of M92 therefore disagree with the predictions of classical evolutionary theory. Four different scenarios which have been suggested to account for the observations cited are discussed. In addition, primordial CNO abundances observed in, or deduced for, metal-poor field and cluster stars are compared with those deduced for M92, and then discussed in connection with the global galactic nucleosynthesis and cluster self-contamination process scenarios.

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