| Issue |
A&A
Volume 404, Number 3, June IV 2003
|
|
|---|---|---|
| Page(s) | 969 - 974 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20030636 | |
| Published online | 06 June 2003 | |
Determination of temperature of the ionizing stars of H II regions
Laboratório de Análise Numérica e Astrofísica, Departamento de Matemática, Universidade Federal de Santa Maria, 97119-900 Santa Maria, RS, Brazil
Corresponding author: O. Dors Jr., oli@lana.ccne.ufsm.br
Received:
24
January
2003
Accepted:
22
April
2003
The determination of temperature (Teff) of
the ionizing stars of HII regions was considered. In this work we used
photoionization models for HII regions ionized by a
single star to show that the index
([
]
3726+3729/[
]λ5007)
can be used to estimate Teff. The relation R vs. Teff
proved to be rather independent of the chemical abundances, but strongly
dependent on the ionization parameter of the nebula. In order to check the
reliability of using R for temperature determination, we compared the values
of Teff obtained via the index R for a sample of HII regions
with data available in the literature with independent estimations.
Key words: ISM: HII regions / stars: fundamental parameters / stars: early-type
© ESO, 2003
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