Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..444m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 444-461.
Astronomy and Astrophysics
Astrophysics
20
Elliptical Galaxies, Galactic Evolution, Star Distribution, Abundance, Lenticular Bodies
Scientific paper
Long-slit spectroscopy, covering the wavelength range 3600-4600 A at 5.3 A FWHM resolution, has been obtained for a sample of seven elliptical and S0 galaxies. Spectral indices have been extracted from the binned spectra, and correlations among the indices have been examined. The CN-D(4000) diagram is shown to be effective at separating the effects of metallicity and age on the integrated spectra. All galaxies in the sample have lower metallicity at larger radii, with gradients of similar magnitude to those found in previous studies. Radial gradients in the age of the most recent epoch of significant star formation have been searched for. The mean ages of the individual galaxies vary by several gigayears, with the youngest bulges belonging to the most bulge-dominated systems.
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