Journal Article

Abundance determination in H <span class="smallCaps">ii</span> regions from spectra without the [O <span class="smallCaps">ii</span>]λ3727+λ3729 line

L. S. Pilyugin and L. Mattsson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 2, pages 1145-1150
Published in print April 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17970.x
Abundance determination in H ii regions from spectra without the [O ii]λ3727+λ3729 line

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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 (R2) 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 R2 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.

Keywords: ISM: abundances; H ii regions; galaxies: abundances

Journal Article.  3504 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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