Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1285t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1285-1301.
Astronomy and Astrophysics
Astronomy
18
Asymptotic Giant Branch Stars, Globular Clusters, Metallicity, Red Giant Stars, Stellar Spectrophotometry, Astronomical Models, Cn Emission, Stellar Evolution, Stellar Spectra
Scientific paper
Oxygen-enhanced theoretical isochrones and luminosity functions by Bergbusch and VandenBerg (1992) are used to determine synthetic stellar spectra for a model globular cluster. Except for the case of enhanced oxygen, the cluster is assumed to have an overall metallicity of A/H = - 0.8, and the isochrones and luminosity functions provide the context for combining spectra. The resulting model spectra are CN-normal or -strong depending on the assumed C, N, and O abundances. This permits an analysis of the CN-band variations in cluster stars and their relation to CN strength in the integrated spectra, and references are made to the observational data from 47 Tuc. If the model is entirely composed of CN-strong spectra, very good correlations are noted with the 47 Tuc data. The modeling effort demonstrates the accuracy of modeling integrated spectra with a combination of data from cluster photometry, synthetic stellar spectra, and theoretical isochrones.
Bell Roger A.
Tripicco Michael J.
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