Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae

We analyse the reliability of oxygen abundances and ionization parameters obtained from a number of diagnostic diagrams. To do this, we used the literature to compile the observational emission-line intensities and oxygen abundances of 446 star-forming regions whose O/H abundances were determined by...

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Autores principales: Dors Junior, O. L., Krabbe, Angela, Hägele, Guillermo Federico, Pérez Montero, Enrique
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Galaxies: general
Galaxies: ISM
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83920
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83920
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Galaxies: general
Galaxies: ISM
spellingShingle Ciencias Astronómicas
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Galaxies: general
Galaxies: ISM
Dors Junior, O. L.
Krabbe, Angela
Hägele, Guillermo Federico
Pérez Montero, Enrique
Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
topic_facet Ciencias Astronómicas
Galaxies: abundances
Galaxies: evolution
Galaxies: formation
Galaxies: general
Galaxies: ISM
description We analyse the reliability of oxygen abundances and ionization parameters obtained from a number of diagnostic diagrams. To do this, we used the literature to compile the observational emission-line intensities and oxygen abundances of 446 star-forming regions whose O/H abundances were determined by direct estimation of the electron temperature. These compiled abundances were compared with the values calculated in this work using various diagnostic diagrams in combination with results from a grid of photoionization models. We found that the [O III]/[O II] versus [N II]/[O II], [O III]/Hβ versus [N II]/[O II] and ([O III]/Hβ)/([N III]/Hα) versus [S II]/[S III] diagnostic diagrams gave O/H values close to those obtained using the electron temperature, with differences of about 0.04 dex and a dispersion of about 0.3 dex. Similar results were obtained by detailed models, but with a dispersion of 0.08 dex. The origin of the dispersion found with the use of diagnostic diagrams is probably the differences between the real N/O-O/H relation of the sample and the one assumed in the models. This is confirmed by the use of detailed models that do not have a fixed N/O-O/H relation. We found no correlation between the ionization parameter and metallicity for the objects of our sample. We conclude that the combination of two line ratios predicted by photoionization models, one sensitive to the metallicity and the other sensitive to the ionization parameter, which takes into account the physical conditions of star-forming regions, gives O/H estimates close to the values derived using direct detections of electron temperature.
format Articulo
Articulo
author Dors Junior, O. L.
Krabbe, Angela
Hägele, Guillermo Federico
Pérez Montero, Enrique
author_facet Dors Junior, O. L.
Krabbe, Angela
Hägele, Guillermo Federico
Pérez Montero, Enrique
author_sort Dors Junior, O. L.
title Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
title_short Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
title_full Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
title_fullStr Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
title_full_unstemmed Analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
title_sort analysing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/83920
work_keys_str_mv AT dorsjuniorol analysingderivedmetallicitiesandionizationparametersfrommodelbaseddeterminationsinionizedgaseousnebulae
AT krabbeangela analysingderivedmetallicitiesandionizationparametersfrommodelbaseddeterminationsinionizedgaseousnebulae
AT hageleguillermofederico analysingderivedmetallicitiesandionizationparametersfrommodelbaseddeterminationsinionizedgaseousnebulae
AT perezmonteroenrique analysingderivedmetallicitiesandionizationparametersfrommodelbaseddeterminationsinionizedgaseousnebulae
bdutipo_str Repositorios
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