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We present spectrum synthesis fits to 808 K+A galaxies selected from theSloan Digital Sky Survey (SDSS) and population synthesis of their spectralenergy distributions, extending from the far UV (0.15 micron) to the mid IR (22micron), based on the results of STARLIGHT code fitting to the SDSS spectra.Our modelling shows that K+A galaxies have undergone a large starburst,involving a median 50% of their present stellar masses, superposed over anolder stellar population. The metal abundance of the intermediate-age starsshows that star formation did not take place in pristine gas, but was part of adramatic increase in the star formation rates for originally gas-rich objects.We find no evidence for on-going QSO activity in the UV, which is well modeledby the emission of intermediate-age stars. We use K+A galaxies as localcounterparts of high redshift objects to test for the presence of ThermallyPulsing AGB stars in similarly-aged populations and find no excess in theinfrared due to emission from such stars, arguing that more distant galaxiesare indeed old and massive at their redshift. All of our galaxies showsignificant excesses in the mid-IR compared to the light from their stars. Wefit this ad hoc with a 300K blackbody. Possible sources include TP-AGB stars,obscured young star clusters and hidden AGNs, heating a significant dustcomponent.

The spectral energy distributions of K+A galaxies from the UV to the mid-IR: stellar populations, star formation and hot dust