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We suggest an empirical calibration for the determination of oxygen and nitrogen abundances and electron temperature in H  ii  regions in which the [O  ii ]λ3727+λ3729 line ( R  2 ) is not available. The calibration is based on the strong emission lines of O ++ , N +  and S +  (NS calibration) and derived using the spectra of H  ii  regions with measured electron temperatures as calibration data points. The NS calibration makes it possible to derive abundances for H  ii  regions in nearby galaxies from Sloan Digital Sky Survey (SDSS) spectra in which the  R  2  line is out of the measured wavelength range, but it can also be used for oxygen and nitrogen abundance determinations in any H  ii  region independently of whether the nebular oxygen line [O  ii ]λ3727+λ3729 is available or not. The NS calibration provides reliable oxygen and nitrogen abundances for H  ii  regions over the whole range of metallicities.

Abundance determination in H ii regions from spectra without the [O ii ]λ3727+λ3729 line