Determination of temperature of the ionizing stars of H II regions

Details Determination of temperature of the ionizing stars of H II regions Determination of temperature of the ionizing stars of H II regions

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...404..969d&link_type=abstract

Astronomy and Astrophysics, v.404, p.969-974 (2003)

Astronomy and Astrophysics

Astrophysics

9

Ism: H Ii Regions, Stars: Fundamental Parameters, Stars: Early-Type

Scientific paper

The determination of temperature (T_eff) of the ionizing stars of H Ii regions was considered. In this work we used photoionization models for H Ii regions ionized by a single star to show that the index R=log ([O Ii]lambda lambda 3726+3729/[O Iii]lambda 5007) can be used to estimate T_eff. The relation R vs. T_eff 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 T_eff obtained via the index R for a sample of H Ii regions with data available in the literature with independent estimations.

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