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Spectroscopic analysis of O-type stars in the upper part of the HR diagram

Published online by Cambridge University Press:  25 May 2016

Artemio Herrero  and
M.R. (Charo) Villamariz
Artemio Herrero
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
M.R. (Charo) Villamariz
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain

Abstract

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We present observations and analyses of stars earlier than 06. The analyses are done with nlte planeparallel, hydrostatic model atmospheres. The effect of line-blocking for the determination of the stellar parameters is studied, and it is concluded that it must be taken into account for very hot stars. It is also shown that planeparallel models cannot fit properly the spectra of very hot stars. Thus, we perform new analyses with Unified Model Atmospheres, which result necessary for the reproduction of the spectra from the very upper part of the HR diagram.

Type
Part 2. Models for single star evolution of massive stars: wind + atmosphere + interior
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 244 - 245
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Herrero, A., Kudritzki, R.P., Vílchez, J.M., Kunze, D., Butler, K., Haser, S. 1992, A&A 261, 209 (Paper I) Google Scholar
Herrero, A. 1994, in: Vanbeveren, D., van Rensbergen, W., de Loore, C. (eds.), Evolution of Massive Stars: A Confrontation between Theory and Observation, SSR 66, 137 Google Scholar
Herrero, A., Kudritzki, R.P., Gabler, R., Vílchez, J.M., Gabler, A. 1995, A&A 297, 556 Google Scholar
Santolaya-Rey, A.E., Puls, J., Herrero, A. 1997, A&A 488, 512 Google Scholar