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We present 65 Sloan Digital Sky Survey (SDSS) spectra of 62 star-forminggalaxies with oxygen abundances 12 + logO/H ~ 7.5-8.4. Redshifts of selectedgalaxies are in the range z~0.36-0.70. This allows us to detect the redshiftedMgII 2797,2803 emission lines. Our aim is to use these lines for the magnesiumabundance determination. The MgII emission was detected in ~2/3 of thegalaxies. We find that the MgII 2797 emission-line intensity follows a trendwith the excitation parameter x= O^{2+}/O that is similar to that predicted byCLOUDY photoionised HII region models, suggesting a nebular origin of MgIIemission. The Mg/O abundance ratio is lower by a factor ~2 than the solarratio. This is probably the combined effect of interstellar MgII absorption anddepletion of Mg onto dust. However, the effect of dust depletion in selectedgalaxies, if present, is small, by a factor of ~2 lower than that of iron.

The Mg II 2797, 2803 emission in low-metallicity star-forming galaxies from the SDSS