On the electron temperature determination in high-metallicity HII regions

Details On the electron temperature determination in high-metallicity HII regions On the electron temperature determination in high-metallicity HII regions

2006-11-27

arxiv.org/abs/astro-ph/0611802v1

Mon.Not.Roy.Astron.Soc.375:685-690,2007

Astronomy and Astrophysics

Astrophysics

7 pages with 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.11333.x

The problem of determination of the electron temperature t_2 in the OII zone of high-metallicity HII region was examined. It was shown that the ratio of nebular to auroral nitrogen line intensities, which is an indicator of the electron temperature t_2, can be expressed in terms of the nebular line intensities of oxygen. This solves the problem of the determination of the electron temperature t_2, since the oxygen nebular lines are strong and, consequently, are readily observable. A relation between electron temperatures in the OII and OIII zones in high-metallicity HII regions was studied. It was found that there is no one-to-one correspondance between t_2 and t_3 temperatures. Instead the t_2 - t_3 relation is dependent on excitation parameter.

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