تقرير
Optical and mid-infrared neon abundance determinations in star-forming regions
| العنوان: | Optical and mid-infrared neon abundance determinations in star-forming regions |
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| المؤلفون: | Dors Jr., Oli L., Hagele, Guillermo F., Cardaci, Monica V., Perez-Montero, Enrique, Krabbe, Angela C., Vilchez, Jose M., Sales, Dinalva A., Riffel, Rogerio, Riffel, Rogemar A. |
| سنة النشر: | 2013 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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. Comment: 17 pages, 14 figures, accepted by MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stt610 |
| URL الوصول: | http://arxiv.org/abs/1304.3185 |
| رقم الأكسشن: | edsarx.1304.3185 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stt610 |
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