A&A 404, 969-974 (2003)
Determination of temperature of the ionizing stars of H II regionsO. L. Dors Jr. and M. V. F. Copetti
Laboratório de Análise Numérica e Astrofísica, Departamento de Matemática, Universidade Federal de Santa Maria, 97119-900 Santa Maria, RS, Brazil
(Received 24 January 2003 / Accepted 22 April 2003)
The determination of temperature ( ) of the ionizing stars of regions was considered. In this work we used photoionization models for regions ionized by a single star to show that the index ([ ] 3726+3729/[ ] 5007) can be used to estimate . The relation R vs. 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 obtained via the index R for a sample of regions with data available in the literature with independent estimations.
Key words: ISM: regions -- stars: fundamental parameters -- stars: early-type
Offprint request: O. Dors Jr., email@example.com
© ESO 2003