Volume 398, Number 3, February II 2003
|Page(s)||949 - 957|
|Published online||28 January 2003|
New color distributions in E-type galaxies*
II. Central and mean metallicities
Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France e-mail: email@example.com
2 Instituto de Astronomia, Geofísica e Ciências Atmosféricas Depto. de Astronomia, Universidade de São Paulo, Av. Miguel Stefano, 4200-CEP 04301-904, S. Paulo, SP-Brazil e-mail: firstname.lastname@example.org
3 Observatoire de Paris, LERMA, 77 Av. Denfert-Rochereau, 75015, Paris, France
Corresponding author: R. Michard, email@example.com
Accepted: 8 November 2002
Central and mean metallicities are calculated for a sample of 40 early-type galaxies, whose color gradients were reported in a previous paper (Idiart et al.2002). The present color-metallicity calibration was derived from a grid of evolutionary models which fit the color-magnitude sequence of ellipticals in Coma and Virgo clusters. The mean metallicity gradient derived from our data is and the mean sample average metallicity is (rmsd). Central and mean metallicities are correlated with the central velocity dispersion, consistent with the interpretation by metallicity variations of the color-magnitude sequence and of color gradients. Age effects are also discussed, in particular concerning the interpretation of the Hβ line strength in those objects.
Key words: galaxies: ellipticals and lenticular, cD / galaxies: abundances
© ESO, 2003
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