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We derive new empirical calibrations for strong-line diagnostics of gas phasemetallicity in local star forming galaxies by uniformly applying the Te methodover the full metallicity range probed by the Sloan Digital Sky Survey (SDSS).To measure electron temperatures at high metallicity, where the auroral linesneeded are not detected in single galaxies, we stacked spectra of more than110,000 galaxies from the SDSS in bins of log[O II]/H$\beta$ and log[OIII]/H$\beta$. This stacking scheme does not assume any dependence ofmetallicity on mass or star formation rate, but only that galaxies with thesame line ratios have the same oxygen abundance. We provide calibrations whichspan more than 1 dex in metallicity and are entirely defined on a consistentabsolute Te metallicity scale for galaxies. We apply our calibrations to theSDSS sample and find that they provide consistent metallicity estimates towithin 0.05 dex.

New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies