Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-23
Astronomy and Astrophysics
Astrophysics
To appear in "Properties of Hot, Luminous Stars", 12th UCL Astronomy Colloquium, Eds. I. Howarth, A. Willis, ASP Conf. Series.
Scientific paper
We discuss recent results on the ionizing fluxes of O stars obtained from our "combined stellar structure and atmosphere models" (CoStar) accounting for stellar winds, non-LTE effects and line blanketing. The implications on the ionization structure of HII regions are summarized, and observational constraints on the ionizing spectra and the total ionizing photon fluxes are presented. Using our CoStar models we derive new consistent predictions for the H and HeI ionizing fluxes of steady-state massive star populations. Implications for the interpretation of observations of `Diffuse Ionized Gas' in galaxies are discussed. Finally we present preliminary model calculations aiming to improve our current predictions further and compare our results to recent results from the Munich group.
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