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Paper: Stellar populations in elliptical galaxies
Volume: 10, Evolution of the Universe of Galaxies: Edwin Hubble Centennial Symposium
Page: 119
Authors: Baum, William A.
Abstract: On the basis of integrated color indices and the strenths of spectral features, bright elliptical galaxies are believed to have high metallicities, even in their halos. Progressive metal enrichment of the stellar population almost certainly required an extended period of time to build up. That scenario is supported by evidence for a wide dispersion in metallicity and age. This paper calls attention to some early inferences about stellar populations in ellipticals, describes recent findings about their metallicity gradients, and summarizes the observed properties that theoretical models of elliptical galaxy formation must take into account. Preparations have been made to use a pixel-statistics method, which is essentially a variant of the old count-brightness method, for interpreting CCD observations of some bright ellipticals with the Hubble Space Telescope.
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