出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a preliminary analysis of the sample of early type galaxies of Rampazzo et al. (2005),
selected to build a data-set of spectral properties of well studied early-type galaxies showing
emission lines. Because of the presence of emission lines, the sample is biased toward objects
that might be expected to have ongoing and recent star formation. We have compared the linestrength
indices presented in Rampazzo et al. (2005) with Simple Stellar Populations (SSPs) in
order to characterize the underlying stellar population of the galaxies. We have derived ages,
metallicities and [a=Fe] ratios. The positive trend of the s-metallicity and s[a=Fe] relations
is reproduced. The bulk of the galaxies span a range in metallicity from solar to twice solar
and a range in [a=Fe] from 0.2 to 0.4. Furthermore the comparison of the derived parameters
at different galactocentric distances shows the presence of negative metallicity gradients from the
center outwards.
