NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T15:38:29 PDT
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For refcode 2003A&A...398..949I:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...398..949I New UBVRI color distributions in E-type galaxies II. Central and mean metallicities T. P. Idiart, R. Michard, J. A. de Freitas Pacheco 1 - Observatoire de la Cote d'Azur, BP 4229, 06304 Nice Cedex 4, France 2 - Observatoire de Paris, LERMA, 77 Av. Denfert-Rochereau, 75015, Paris, France 3 - Instituto de Astronomia, Geofisica e Ciencias Atmosfericas Depto. de Astronomia, Universidade de Sao Paulo, Av. Miguel Stefano, 4200-CEP 04301-904, S. Paulo, SP-Brazil Received 17 September 2001/ Accepted 8 November 2002 Abstract. 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 ({DELTA}[Fe/H]/{DELTA} log r) = -0.26 +/- 0.08and the mean sample average metallicity is <[Fe/H]> = 0.01 +/- 0.11 (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 H{beta} line strength in those objects. Key words: galaxies: ellipticals and lenticular, cD - galaxies: abundances
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