Aims.Our aims are to estimate the validity of empirical methods, such as R23, , log([N ii]/Hα) (N2), log[ ([O iii]/Hβ)/ ([N ii]/Hα)] (O3N2), and log([S ii]/Hα) (S2), and to re-derive (or add) the calibrations of R23, N2, O3N2, and S2 indices for oxygen abundances on the basis of a large sample of galaxies with Te-based abundances.
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Yin et al. (2006) studied this question.
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