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We combine UV/Optical/near-IR/mid-IR data on a sample of ~240 S0 galaxies toexamine various star formation related processes in them. We split the sampleinto bright and faint S0 galaxies based on their K band luminosity. Comparingthe FUV-NUV versus NUV-K color-color diagram with a Simple Stellar Population(SSP) model shows that ellipticals and bright S0 galaxies are dominated by astellar population of age > 10^9 years while faint S0 galaxies may containstars as young as 10^8 years, providing evidence for relatively recent starformation activity. The strength of the 4000A break is also systematicallyhigher in brighter S0 galaxies, again indicating the presence of an old stellarpopulation. Their mid-IR colours indicate that bright S0 colours are like thoseof ellipticals while faint S0 colours are more like spirals. All theseobservations are consistent with a scenario in which low-luminosity S0 galaxieslikely formed by the stripping of gas from the discs of late-type spiralgalaxies, which in turn formed their pseudo bulges through secular evolutionprocesses, possibly involving multiple episodes of star formation. On the otherhand, more luminous S0 galaxies likely formed the bulk of their stars at earlyepochs, similar to the star formation in elliptical galaxies, and arecharacterised by an old coeval stellar population and classical bulge

Luminosity dependent star-formation history of S0 galaxies: evidence from GALEX-SDSS-2MASS-WISE colours