Astron. Astrophys. 322, 598-614 (1997)

Footnotes

1. At this point, we adopt the Schmidt-Kaler classification instead of the more recent one from Vacca et al.  (1996) since the latter does not cover the entire domain of our models.

2. We specify in kK, which gives a reasonably large weight to the temperature.

3. At high temperatures the results from Kurucz models do not depend sensitively on gravity and should thus allow for an appropriate comparison.

4. In both models the H and He groundstates are overpopulated.

5. Non-LTE effects are still of importance and one therefore does not expect the results to agree with the Kurucz models in this domain.

6. In model F3 the He enrichment further augments this behaviour.

7. For clarification a brief comment on the procedure of Vacca et al.  (1996) for deriving Kurucz ionizing fluxes appears useful: A shown in Fig. 1 the Kurucz (1991) models only cover the domain of the 20 and 25 track. It is important to note that for the rest of the domain of interest, which corresponds to all O3 to O9 stars, extrapolations combined with blackbody spectra are used to extend the Kurucz grid to the desired lower gravities.

8. Non-LTE effects even decrease the EUV flux for the parameters of interest.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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