Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..800b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 800-807.
Astronomy and Astrophysics
Astrophysics
19
Abundance, Astronomical Spectroscopy, Cn Emission, Globular Clusters, Subgiant Stars, Carbon 12, Carbon 13, Metallicity, Stellar Spectra, Stellar Structure
Scientific paper
Spectroscopic observations of subgiants in the metal-rich globular cluster 47 Tucanae are used to measure the strengths of the CN bands located at 3883 A and 4215 A. A bimodal distribution is clearly seen in the 3883 A CN band strengths, but not in the 4215 A bands. Synthetic spectrum calculations are used to probe the effect on both CN bands of varying the C-12/C-13 ratio. The sensitivity of the 3883 A CN feature to C-13 relative abundance is found to be considerably higher than that of the 4215 A band for the stars observed. Thus, spectroscopic indices derived from these features are observable probes of atmospheric C-13/C-12 enhancements. It is suggested that the bimodality observed in the 3883 A CN band may be due largely to a difference in the C-12/C-13 ratios of the two groups.
Bell Roger A.
Briley Michael M.
Hesser James Edward
Smith Graeme H.
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