Measuring Chemical Abundances in Extragalactic Metal-Rich HII Regions

Details Measuring Chemical Abundances in Extragalactic Metal-Rich HII Regions Measuring Chemical Abundances in Extragalactic Metal-Rich HII Regions

2006-08-19

arxiv.org/abs/astro-ph/0608410v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures. Review paper, "The Metal-Rich Universe", (La Palma, June 2006), eds. G. Israelian and G. Meynet (Cambridg

Scientific paper

The analysis of metal-rich HII regions has a profound impact on the calibration of abundance diagnostics widely used to measure the chemical content of star-forming galaxies, both locally and at high redshift. I review the main difficulties that affect direct abundance determinations from temperature-sensitive collisionally excited lines, and briefly discuss strong-line methods, in particular their empirical calibration. In the near future it will be possible to calibrate strong-line methods using metal recombination lines, providing abundances that are virtually insensitive to uncertainties on the nebular temperature structure.

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