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The individual star formation histories of bulges and discs of lenticular(S0) galaxies can provide information on the processes involved in thequenching of their star formation and subsequent transformation from spirals.In order to study this transformation in dense environments, we have decomposedlong-slit spectroscopic observations of a sample of 21 S0s from the VirgoCluster to produce one-dimensional spectra representing purely the bulge anddisc light for each galaxy. Analysis of the Lick indices within these spectrareveals that the bulges contain consistently younger and more metal-richstellar populations than their surrounding discs, implying that the finalepisode of star formation within S0s occurs in their central regions. Analysisof the $\alpha$-element abundances in these components further presents apicture in which the final episode of star formation in the bulge is fueledusing gas that has previously been chemically enriched in the disc, indicatingthe sequence of events in the transformation of these galaxies. Systems inwhich star formation in the disk was spread over a longer period contain bulgesin which the final episode of star formation occurred more recently, as onemight expect for an approximately coeval population in which the transformationfrom spiral to S0 occurred at different times. With data of this quality andthe new analysis method deployed here, we can begin to describe this process ina quantitative manner for the first time.

The Origin of S0s in Clusters: evidence from the bulge and disc star formation histories