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Date and Time of the Query: 2019-08-18 T21:02:37 PDT
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For refcode 2007MNRAS.381.1719V:
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Copyright by Royal Astronomical Society. 2007MNRAS.381.1719V The S2N2 metallicity calibrator and the abundance gradient of M 33 K. Viironen, G. Delgado-Inglada, A. Mampaso, L. Magrini and R. L. M. Corradi Abstract. We introduce the log(H{alpha}/[S II]{lambda}{lambda}6717+6731) versus log(H{alpha}/[N II]{lambda}6583) (S2N2) diagnostic diagram as a metallicity and ionization parameter indicator for H II regions in external galaxies. The location of H II regions in the S2N2 diagram was studied both empirically and theoretically. We found that, for a wide range of metallicities, the S2N2 diagram gives single-valued results in the metallicity-ionization parameter plane. We demonstrate that the S2N2 diagram is a powerful tool to estimate metallicities of high-redshift (z ~ 2) H II galaxies. Finally, we derive the metallicity for 76 H II regions in M 33 from the S2N2 diagram and calculate an O/H abundance gradient for this galaxy of -0.05 (+/- 0.01) dex kpc^-1^. Key words: HII regions, galaxies: abundances, galaxies: high-redshift, galaxies: individual: M33
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