  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
line-strength 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 [alpha/Fe] ratios. The
positive trend of the sigma-metallicity and sigma-[alpha/Fe] relations is
reproduced. The bulk of the galaxies span a range in metallicity from ~ solar
to ~ twice solar and a range in [alpha/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.
