Poster Title: Constraints on metallicities and ages from moderately high resolution spectra
Abstract: We use a new, medium-high resolution population synthesis model to estimate stellar metallicities, r-band light weighted ages and stellar masses for a sample of $\sim10^5$ galaxies of the SDSS DR1. We derive median-likelihood estimates of these parameters, based on the fit of 9 spectral absorption features that are well reproduced by our model and depend only weakly on element abundance ratios. Our sample includes galaxies containing stars in the full range of ages, from passive, early-type galaxies to actively star-forming, late-type galaxies. After assessing the accuracy to which we can constrain the physical parameters of galaxies in this way, we investigate the relations between stellar metallicity and various quantities such as age, stellar mass, colors and magnitudes.
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