Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195...76b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 76-92.
Astronomy and Astrophysics
Astrophysics
291
Galactic Evolution, Galactic Nuclei, Spiral Galaxies, Star Clusters, Globular Clusters, Metallic Stars, Red Shift
Scientific paper
A novel galactic-nucleus population-synthesis technique is described and demonstrated. The procedure is applicable to normal nuclei of E/S0 and spiral galaxies and employs a data base of integrated star-cluster spectra, thus reducing the number of parameters in the analysis to two (age and metallicity), as proposed by Bica and Alloin (1986). Results are presented in extensive tables and spectra and discussed in detail. The populations in the E/S0s with normal metallicity/luminosity relations are found to comprise mainly stars older than 10 Gyr, with some as young as about 5 Gyr; younger groups are superimposed on older, solar-metallicity populations in the bluer spirals. In NGC 5236, for example, 87 and 57 percent of the flux at 400 and 900 nm, respectively, is attributed to stars younger than about 300 Myr.
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