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We have derived the oxygen abundance for a sample of nearby galaxies in theData Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at leasttwo independent spectra of one or several HII regions with a detected[OIII]4363 auroral line. Since, for nearby galaxies, the [OII]3727 nebular lineis out of the observed wavelength range, we propose a method to derive (O/H)_ffabundances using the classic Te method coupled with the ff relation. (O/H)_7325abundances have also been determined, based on the [OII]7320,7330 lineintensities, and using a small modification of the standard Te method. The(O/H)_ff and (O/H)_7325 abundances have been derived with both the one- andtwo-dimensional t_2 - t_3 relations. It was found that the (O/H)_ff abundancesderived with the parametric two-dimensional t_2 - t_3 relation are mostreliable. Oxygen abundances have been determined in 29 nearby galaxies, basedon 84 individual abundance determinations in HII regions. Because of ourselection methods, the metallicity of our galaxies lies in the narrow range 8.2< 12 + log (O/H) < 8.4. The radial distribution of oxygen abundances in thedisk of the spiral galaxy NGC 4490 is determined for the first time.

The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra