Statistics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222...14t&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 14-22. Research supported by the Alfred P. Sloan Foundation
Statistics
129
Elliptical Galaxies, Giant Stars, Late Stars, M Stars, Astronomical Models, Chemical Composition, Metallic Stars, Stellar Luminosity, Ubv Spectra
Scientific paper
Models for elliptical galaxies are examined with respect to recent infrared data, and the models are revised to incorporate new theoretical isochrones for stars evolving from the main sequence to the base of the giant branch. Infrared colors and spectral features, which are very sensitive to the luminosity function of late M giants, can be reproduced by means of a function that is consistent with theory and with statistics of old-disk giants. Since models with different chemical compositions show that the metal abundance strongly affects all colors, syntheses using data with higher spectral resolution will not provide highly accurate age determinations unless composition is fully accounted for. Metallicity-mass relations are discussed.
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