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We present Hubble Space Telescope photometry of young stars in NGC 5102, anearby gas-rich post-starburst S0 galaxy with a bright young stellar nucleus.We use the IAC-pop/MinnIAC algorithm to derive the recent star formationhistory in three fields in the bulge and disk of NGC 5102. In the disk fields,the recent star formation rate has declined monotonically and is now barelydetectable, but a starburst is still in progress in the bulge and has addedabout 2 percent to the mass of the bulge over the last 200 Myr. Other studiesof star formation in NGC 5102 indicate that about 20 percent of its stellarmass was added over the past Gyr. If this is correct, then much of the stellarmass of the bulge may have formed over this period. It seems likely that thisstar formation was fueled by the accretion of a gas-rich system with HI mass ofabout 2 x 10^9 Msol which has now been almost completely converted into stars.The large mass of recently formed stars and the blue colours of the bulgesuggest that the current starburst, which is now fading, may have made asignificant contribution to build the bulge of NGC 5102.

The Recent Star Formation History of NGC 5102