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Multi-color photometry is presented for a sample of 60 dwarf ellipticals (dE)selected by morphology. The sample uses data from GALEX, SDSS and WISE toinvestigate the colors in filters NUV, ugri and W1 (3.4mum). We confirm theblueward shift in the color-magnitude relation for dwarf ellipticals, comparedto CMR for bright ellipticals, as seen in previous studies. However, we findthe deviation in color across the UV to near-IR for dE's is a strong signal ofa younger age for dwarf ellipticals, one that indicates decreasing mean agewith lower stellar mass. Lower mass dE's are found to have mean ages of 4 Gyrsand mean [Fe/H] values of -1.2. Age and metallicity increase to the mostmassive dE's with mean ages similar to normal ellipticals (12 Gyrs) and theirlowest metallicities ([Fe/H] = -0.3). Deduced initial star formation rates fordE's, combined with their current metallicities and central stellar densities,suggests a connection between field LSB dwarfs and cluster dE's, where thecluster environment halts star formation for dE's triggering a separateevolutionary path.

Colors of Dwarf Ellipticals from GALEX to WISE