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The influence of new NLTE model atmospheres with wind effects in nebular modeling

Published online by Cambridge University Press:  25 May 2016

T. M. Yamamoto ,
F. H. Sellmaier ,
A. W. A. Pauldrach  and
T. Hoffmann
T. M. Yamamoto
Affiliation:
1Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo, 181 Japan 2Institut für Astronomie und Astrophysik der Universität München, München, Germany
F. H. Sellmaier
Affiliation:
2Institut für Astronomie und Astrophysik der Universität München, München, Germany
A. W. A. Pauldrach
Affiliation:
2Institut für Astronomie und Astrophysik der Universität München, München, Germany
T. Hoffmann
Affiliation:
2Institut für Astronomie und Astrophysik der Universität München, München, Germany

Extract

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Emergent fluxes from a non-LTE model atmosphere code designed to calculate realistic O star atmospheres are applied to nebular calculations. The stellar models include wind and blocking effects due to several million doppler-shifted lines in the radiation driven atmosphere in a full NLTE treatment. These lines, which arise from heavy elements, reduce the stellar flux drastically between 228 and 912 å (Pauldrach et al. 1994) — the most important frequency regime for ionization in gaseous nebulae. We have three models with effective temperatures of 50000, 40000 and 35 000 K and log g values of 3.9, 3.8 and 3.5 respectively. They have been used to model Hii regions and their use has led to significant differences in the ionization structure of the nebular models.

Type
III. Central Stars
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 135
Copyright
Copyright © Kluwer 1997 

References

Pauldrach, A. W. A., Kudritzki, R. P., Puls, J., Butler, K., Hunsinger, J., 1994, Astron. Astrophys., 283, 525.Google Scholar
Sellmaier, F. H., Yamamoto, T., Pauldrach, A. W. A., Rubin, R. H., 1996, Astron. Astrophys., 305, L37.Google Scholar
(T. Yamamoto in the letter is the same as the first author T. M. Yamamoto).Google Scholar