Abstract
Physical conditions and the oxygen and nitrogen abundances in 36 SBS galaxies with UV excesses and/or without UV excesses, but with emission lines, are determined using spectra from the SDSS DR7. It is found that SBS 0808+578 is an AGN, while the other objects are either HII galaxies or HII regions in galaxies. For all these objects the oxygen abundance 12+log(O/H) lies within a range of 7.85–8.61, and the ratio log(N/O) lies within a range of -1.45 to -0.4. On an N/O-O/H diagram they occupy the same region as high-excitation HII regions. No galaxies with a high metal deficit were found. The star formation rates (SFR) of these galaxies were determined from their Ha fluxes and found to lie within a range of 0.001÷6 M⨀ year-1, close to the values for typical star formation regions in spiral and irregular galaxies.
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