Other
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97...89b&link_type=abstract
(Astronomical Society of the Pacific, Symposium on Stellar Populations, University of California, Santa Cruz, CA, July 1984) Ast
Other
42
Astronomical Spectroscopy, Galactic Nuclei, Globular Clusters, Stellar Composition, Stellar Evolution, Abundance, Andromeda Galaxy, Galactic Clusters, Hertzsprung-Russell Diagram, Metallicity
Scientific paper
It is shown that intrinsic differences in the integrated spectra of stellar populations in Galactic globular clusters, in M 31, and in giant elliptical galaxies may put constraints on current estimates of age and abundances. Some of these differences include: differences in the observed line strengths of CNO-based absorption line features (CN, CO, and H2O) relative to one another and relative to broadband color indices and Fe-peak absorption-line strengths; and differences in the strengths of Balmer lines relative to both CNO-based features and broadband features. Recent observational data confirming the differences is reviewed. It is concluded that present uncertainties in stellar synthesis techniques may restrict the ages of stars in giant elliptical galaxies brighter than M 31 to between 5 to 15 billion years.
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