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We utilize color information for an HI-selected sample of 195 galaxies toexplore the star formation histories and physical conditions that produce theobserved colors. We show that the HI selection creates a significant offsettowards bluer colors that can be explained by enhanced recent bursts of starformation. There is also no obvious color bimodality, because the HI selectionrestricts the sample to bluer, actively star forming systems, diminishing theimportance of the red sequence. Rising star formation rates are still requiredto explain the colors of galaxies bluer than g-r < 0.3. We also demonstratethat the colors of the bluest galaxies in our sample are dominated by emissionlines and that stellar population synthesis models alone (without emissionlines) are not adequate for reproducing many of the galaxy colors. Theseemission lines produce large changes in the r-i colors but leave the g-r colorlargely unchanged. In addition, we find an increase in the dispersion of galaxycolors at low masses that may be the result of a change in the star formationprocess in low-mass galaxies.

HI Selected Galaxies in the Sloan Digital Sky Survey II: The Colors of Gas-Rich Galaxies