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., firstname.lastname@example.org
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