Mathematics – Logic
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..716w&link_type=abstract
Astrophysical Journal, vol. 209, Nov. 1, 1976, pt. 1, p. 716-733.
Mathematics
Logic
45
Galactic Nuclei, Globular Clusters, Stellar Spectra, Stellar Spectrophotometry, Astronomical Catalogs, Dwarf Stars, Galactic Structure, Giant Stars, M Stars, Metals, Spectral Bands
Scientific paper
Spectra from 3800 to 6800 A with resolution of 2 A have been obtained for 137 stars, five globular clusters, and the nuclear regions of 10 galaxies. Line indices measured for 74 absorption lines and bands are presented. A method for determining parametrized stellar-population models is discussed and shown to be more objective than previous methods. Population models and error estimates are derived for the 10 galaxies. Most of the models have significant contributions from M giant stars and from metal-poor stars. Only two of the galaxies seem to contain stars with metal lines stronger than those of stars in the solar neighborhood. Three of the ellipticals show evidence of recent star formation, possibly due to infall of gas from nearby spirals. The galaxies studied here can be divided by morphological type into three distinct population groups: E0-Sa, Sb, and Sc.
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