%0 Journal Article
%T Optical and mid-infrared neon abundance determinations in star-forming regions
%A Oli L. Dors Jr.
%A Guillermo F. Hagele
%A Monica V. Cardaci
%A Enrique Perez-Montero
%A Angela C. Krabbe
%A Jose M. Vilchez
%A Dinalva A. Sales
%A Rogerio Riffel
%A Rogemar A. Riffel
%J Physics
%D 2013
%I arXiv
%R 10.1093/mnras/stt610
%X We employed observational spectroscopic data of star-forming regions compiled from the literature and photoionization models to analyse the neon ionic abundances obtained using both optical and mid-infrared emission-lines. Comparing Ne++/H+ ionic abundances from distinct methods, we found that, in average, the abundances obtained via IR emission-lines are higher than those obtained via optical lines by a factor of 4. Photoionization models with abundance variations along the radius of the hypothetical nebula provide a possible explanation for a large part of the difference between ionic abundances via optical and infrared emission-lines. Ionization Correction Factor (ICF) for the neon is obtained from direct determinations of ionic fractions using infrared emission-lines. A constant Ne/O ratio (logNe/O \approx -0.70) for a large range of metallicity, independently of the ICF used to compute the neon total abundance is derived.
%U http://arxiv.org/abs/1304.3185v1