Line temperatures and elemental abundances in HII galaxies

Details Line temperatures and elemental abundances in HII galaxies Line temperatures and elemental abundances in HII galaxies

2003-09-02

arxiv.org/abs/astro-ph/0309057v1

Mon.Not.Roy.Astron.Soc.346:105,2003

Astronomy and Astrophysics

Astrophysics

16 pages, 11 Postscript figures. Accepted for publication by MNRAS

Scientific paper

10.1046/j.1365-2966.2003.07064.x

We present long-slit spectrophotometric observations in the red and near infrared of 12 HII galaxies. The spectral range includes the sulphur lines [SII] at wavelengths 6716, 6731 angstroms and [SIII] at 6312 angstroms and 9069, 9532 angstroms. For all of the observed galaxies, at least three ion-weighted temperatures from forbidden auroral to nebular line ratios have been obtained and the relations between the different line temperatures have been discussed. It is found that, for some objects, the [OII] temperatures derived from those of [OIII] through the use of photo-ionisation models, without taking into account the effect of density, can lead to a significant underestimate of the O+/H+ ionic abundance and hence of the total oxygen abundance.

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