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We present the results of an optical spectroscopic study of 12GALEX-discovered star-forming Lyman alpha emitting galaxies (LAEs) at z ~ 0.3.We measure the emission line fluxes from these galaxies by fitting theirobserved spectra to stellar population models in order to correct forunderlying stellar absorption. We revisit earlier stellar population modelfitting results, finding that excluding now-known AGNs lowers the typicalstellar population age and stellar mass of this sample to ~ 300 Myr and ~ 4 x10^9 Msol, respectively. We calculate their dust extinction using the Balmerdecrement, and find a typical visual attenuation of Av ~ 0.3 mag, similar tothat seen in many high-redshift LAEs. Comparing the ratio of Lyalpha/Halpha andthe Lyman alpha equivalent widths to the measured dust extinction, we find thatthe ISMs in these objects appear to be neither enhancing nor seriouslyattenuating the Lyman alpha equivalent widths, as would be the case in aquasi-clumpy ISM. Lastly, we perform a detailed analysis of the gas-phasemetallicities of these galaxies, and we find that most galaxies in our samplehave Z < 0.4 Zsol. We find that at a fixed stellar mass, these low-redshift LAEanalogs are offset by ~ 0.6 dex lower in metallicity from the general galaxypopulation at similar redshifts based on the local mass-metallicityrelationship. This implies that galaxies with Lyman alpha in emission may besystematically more metal poor than star-forming galaxies at the same stellarmass and redshift, similar to preliminary results at z ~ 2.

Dust Extinction and Metallicities of Star-Forming Lyman Alpha Emitting Galaxies at Low Redshift