Improved Ionization Correction Factors for Planetary Nebula Abundance Determinations

Details Improved Ionization Correction Factors for Planetary Nebula Abundance Determinations Improved Ionization Correction Factors for Planetary Nebula Abundance Determinations

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923911m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #239.11

Astronomy and Astrophysics

Astronomy

Scientific paper

An ionization correction factor (ICF) is a quantity which accounts for the contribution of unobserved ions when determining an element's total abundance. We present improved methods for calculating ICFs for many metals including oxygen, carbon, and neon. We use a grid of over 500 planetary nebula models generated by the program Cloudy, covering ranges in Teff, gas density, and metallicity of 30,000K to 500,000K, 100 to 30,000 cm-2, and 10-0.6 to 100.4 times solar, respectively. In the important case of oxygen, we find that a constant ICF of 1.076 for models with 30,000K ≤ Teff ≤ 100,000K generates a relative percent error no larger than 6.07%.

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