Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..436t&link_type=abstract
(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te
Astronomy and Astrophysics
Astrophysics
6
Cosmology, Elliptical Galaxies, Galactic Evolution, Stellar Evolution, Astronomical Models, Dwarf Stars, Red Shift, Ubv Spectra
Scientific paper
How the evolution of stars in ordinary galaxies, and in particular elliptical galaxies, affects tentative results in observational cosmology is considered. Only Friedmann models with zero cosmological constant are taken into account. Colors and luminosities are computed as a function of age for a series of model galaxies. Special attention is given to the evolution of color (Stebbins-Whitford effect), unevolving dwarf stars, stellar evolution below and above the main-sequence turnoff, and the relationship between stellar magnitude and redshift. Numerical models for elliptical galaxies are considered, and detailed single-generation models are discussed.
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