Examination of Systematic Errors in Abundances Derived From Nebular Spectra

Details Examination of Systematic Errors in Abundances Derived From Nebular Spectra Examination of Systematic Errors in Abundances Derived From Nebular Spectra

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rmxac..23...93m&link_type=abstract

The Ninth Texas-Mexico Conference on Astrophysics (Eds. S. Torres-Peimbert & G. MacAlpine) Revista Mexicana de Astronomía y Astr

Astronomy and Astrophysics

Astrophysics

Hregions, Ism: Abundances

Scientific paper

We examine the global accuracy of the typical methodology for inferring elemental abundances from H II region spectra. A grid of constant-density models is constructed and used to build a suite of the required "ionization correction factors" (iCF^s). We apply these to the ionic abundances of the constant-density models inferred from their synthetic spectra, as well as models with narrow exponential edges and models of individual bright knots. Comparison of the elemental abundances used in the models to those inferred from the iCF^s show deviations large with respect to the expected accuracy of the analysis procedure. These inaccuracies follow different trends among the three models, suggesting no simple fix useful for arbitrary nebulae.

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