Optical and mid-infrared neon abundance determinations in star-forming regions

Autor(es)

Dors, Jr., Oli L. ^[1] ; Haegele, Guillermo F. ^{[2, 3]} ; Cardaci, Monica V. ^{[2, 3]} ; Perez-Montero, Enrique ^[4] ; Krabbe, Angela C. ^[1] ; Vilchez, Jose M. ^[4] ; Sales, Dinalva A. ^[5] ; Riffel, Rogerio ^[5] ; Riffel, Rogemar A. ^[6]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata - Argentina

^[3] Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF - Argentina

^[4] CSIC, Inst Astrofis Andalucia, E-18080 Granada - Spain

^[5] Univ Fed Rio Grande do Sul, BR-91501970 Porto Alegre, RS - Brazil

^[6] Univ Fed Santa Maria, BR-97105900 Santa Maria, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 432, n. 3, p. 2512-2528, JUL 2013.
• Citações Web of Science: 10

Resumo

We have used 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 have found that, on average, the abundances obtained via infrared 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. The ionization correction factor (ICF) for the neon is obtained from direct determinations of ionic fractions using infrared emission lines. We derive a constant Ne/O ratio (log Ne/O approximate to -0.70) for a large range of metallicities, independently of the ICF used to compute the neon total abundance. (AU)

• Processo FAPESP: 10/01490-3 - Galáxias em interação: efeitos na população estelar e nas propriedades físicas do gás ionizado
• Beneficiário: Angela Cristina Krabbe
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 09/14787-7 - Propriedades físicas de regiões de formação estelar em anéis circumnucleares e em (U)LIRGs
• Beneficiário: Oli Luiz Dors Junior
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores