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A detailed analysis of how environment affects the star formation history ofearly-type galaxies (ETGs) is undertaken via high signal to noise ratio stackedspectra obtained from a sample of 20,977 ETGs (morphologically selected) fromthe SDSS-based SPIDER survey. Two major parameters are considered for thestudy: the central velocity dispersion (sigma), which relates to local driversof star formation, and the mass of the host halo, which relates toenvironment-related effects. In addition, we separate the sample betweencentrals (the most massive galaxy in a halo) and satellites. We derive trendsof age, metallicity, and [alpha/Fe] enhancement, with sigma. We confirm thatthe major driver of stellar population properties in ETGs is velocitydispersion, with a second-order effect associated to the central/satellitenature of the galaxy. No environmental dependence is detected for satelliteETGs, except at low sigma - where satellites in groups or in the outskirts ofclusters tend to be younger than those in the central regions of clusters. Incontrast, the trends for centrals show a significant dependence on halo mass.Central ETGs in groups (i.e. with a halo mass >10^12.5 M_Sun) have youngerages, lower [alpha/Fe], and higher internal reddening, than "isolated" systems(i.e. centrals residing in low-mass, <10^12.5 M_Sun, halos). Our findings implythat central ETGs in groups formed their stellar component over longer timescales than "isolated" centrals, mainly because of gas-rich interactions withtheir companion galaxies.

SPIDER X - Environmental effects in central and satellite early-type galaxies through the stellar fossil record