Other
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..144t&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 144-159. Research supported by the Swiss National Science Foundation
Other
107
Abundance, Giant Stars, Globular Clusters, Stellar Evolution, Stellar Spectrophotometry, Carbon Stars, Interstellar Extinction, Late Stars, Metallicity, Nitrogen, Stellar Spectra
Scientific paper
The authors derive carbon and nitrogen abundances for 33 giant-star members of the globular cluster M15, thus extending their earlier work in M92 to another cluster of comparably low metallicity ([M/H] ⪉ -2). They describe a technique for obtaining C and N abundances which is based on spectrophotometric indices that measure the strengths of NH, CN, and CH bands in low-resolution scanner spectra. The spectrophotometric indices are calibrated using scanner spectra of M92 giant stars in which estimates of C and N abundances had previously been obtained by the method of spectrum synthesis. The complex behavior of C and N abundances in M15 giants cannot be adequately described by models based on classical evolutionary theory. The scenarios already advanced to explain these abundance patterns in the case of M92 are discussed briefly in connection with M15.
Carbon Duane F.
Kraft Ralph Porter
Langer Edward G.
Suntzeff Nicholas B.
Trefzger D. V.
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