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The Ionization Equilibrium of Iron in H II Regions

Published online by Cambridge University Press:  26 May 2016

M. Rodríguez  and
R.H. Rubin
M. Rodríguez
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica, INAOE, Apdo. Postal 51 & 216, Puebla, Pue 72000, Mexico
R.H. Rubin
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035-1000, USA

Abstract

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We study the ionization equilibrium of Fe using photoionization models that incorporate improved values for the relevant atomic data. The previously available photoionization models predict concentrations of Fe3+ which are a factor of 3-8 higher than the values inferred from emission lines of [Fe III] and [Fe IV]. Our new models reduce these discrepancies to factors of 2-5. We comment on the possible reasons behind the remaining discrepancies, and present an updated ionization correction factor for obtaining the Fe abundance from the Fe++ abundance.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 188 - 189
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

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