Effective temperature of ionizing stars of extragalactic HII regions
The effective temperature (Teff) of the radiation field of the ionizing star(s) of a large sample of extragalactic HII regions was estimated using the R = log([O II] (λλ3726 + 29)/[O III] λ5007) index. We used a grid of photoionization models to calibrate the Teff-R relation finding that it has a st...
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
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2017
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93659 |
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I19-R120-10915-936592024-06-25T17:42:51Z http://sedici.unlp.edu.ar/handle/10915/93659 Effective temperature of ionizing stars of extragalactic HII regions Dors, Oli LUiz Hägele, Guillermo Federico Cardaci, Mónica Viviana Krabbe, Angela Cristina 2017-01-07 2020-04-17T15:09:00Z en Ciencias Astronómicas galaxies: abundances galaxies: evolution galaxies: formation galaxies: general galaxies: ISM The effective temperature (Teff) of the radiation field of the ionizing star(s) of a large sample of extragalactic HII regions was estimated using the R = log([O II] (λλ3726 + 29)/[O III] λ5007) index. We used a grid of photoionization models to calibrate the Teff-R relation finding that it has a strong dependence with the ionizing parameter, while it shows a weak direct dependence with the metallicity (variations in Z imply variations in U) of both the stellar atmosphere of the ionizing star and the gas phase of the HII region. Since the R index varies slightly with the Teff for values larger than 40 kK, the R index can be used to derive the Teff in the 30-40 kK range. A large fraction of the ionization parameter variation is due to differences in the temperature of the ionizing stars and then the use of the (relatively) low Teff dependent S2 = [S II] (λλ6717 + 31)/Hα emission-line ratio to derive the ionization parameter is preferable over others in the literature. We propose linear metallicity dependent relationships between S2 and U. Teff and metallicity estimations for a sample of 865 HII regions, whose emission-line intensities were compiled from the literature, do not show any Teff-Z correlation. On the other hand, it seems to be hints of the presence of an anticorrelation between Teff-U.We found that the majority of the studied HII regions (~87 per cent) present Teff values in the range between 37 and 40 kK, with an average value of 38.5(±1) kK. We also studied the variation of Teff as a function of the galactocentric distance for 14 spiral galaxies. Our results are in agreement with the idea of the existence of positive Teff gradients along the disc of spiral galaxies. Instituto de Astrofísica de La Plata Articulo Preprint http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 726-737 |
| 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, Oli LUiz Hägele, Guillermo Federico Cardaci, Mónica Viviana Krabbe, Angela Cristina Effective temperature of ionizing stars of extragalactic HII regions |
| topic_facet |
Ciencias Astronómicas galaxies: abundances galaxies: evolution galaxies: formation galaxies: general galaxies: ISM |
| description |
The effective temperature (Teff) of the radiation field of the ionizing star(s) of a large sample of extragalactic HII regions was estimated using the R = log([O II] (λλ3726 + 29)/[O III] λ5007) index. We used a grid of photoionization models to calibrate the Teff-R relation finding that it has a strong dependence with the ionizing parameter, while it shows a weak direct dependence with the metallicity (variations in Z imply variations in U) of both the stellar atmosphere of the ionizing star and the gas phase of the HII region. Since the R index varies slightly with the Teff for values larger than 40 kK, the R index can be used to derive the Teff in the 30-40 kK range. A large fraction of the ionization parameter variation is due to differences in the temperature of the ionizing stars and then the use of the (relatively) low Teff dependent S2 = [S II] (λλ6717 + 31)/Hα emission-line ratio to derive the ionization parameter is preferable over others in the literature. We propose linear metallicity dependent relationships between S2 and U. Teff and metallicity estimations for a sample of 865 HII regions, whose emission-line intensities were compiled from the literature, do not show any Teff-Z correlation. On the other hand, it seems to be hints of the presence of an anticorrelation between Teff-U.We found that the majority of the studied HII regions (~87 per cent) present Teff values in the range between 37 and 40 kK, with an average value of 38.5(±1) kK. We also studied the variation of Teff as a function of the galactocentric distance for 14 spiral galaxies. Our results are in agreement with the idea of the existence of positive Teff gradients along the disc of spiral galaxies. |
| format |
Articulo Preprint |
| author |
Dors, Oli LUiz Hägele, Guillermo Federico Cardaci, Mónica Viviana Krabbe, Angela Cristina |
| author_facet |
Dors, Oli LUiz Hägele, Guillermo Federico Cardaci, Mónica Viviana Krabbe, Angela Cristina |
| author_sort |
Dors, Oli LUiz |
| title |
Effective temperature of ionizing stars of extragalactic HII regions |
| title_short |
Effective temperature of ionizing stars of extragalactic HII regions |
| title_full |
Effective temperature of ionizing stars of extragalactic HII regions |
| title_fullStr |
Effective temperature of ionizing stars of extragalactic HII regions |
| title_full_unstemmed |
Effective temperature of ionizing stars of extragalactic HII regions |
| title_sort |
effective temperature of ionizing stars of extragalactic hii regions |
| publishDate |
2017 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93659 |
| work_keys_str_mv |
AT dorsoliluiz effectivetemperatureofionizingstarsofextragalactichiiregions AT hageleguillermofederico effectivetemperatureofionizingstarsofextragalactichiiregions AT cardacimonicaviviana effectivetemperatureofionizingstarsofextragalactichiiregions AT krabbeangelacristina effectivetemperatureofionizingstarsofextragalactichiiregions |
| _version_ |
1807220526875148288 |