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Non — LTE analysis of massive O-stars

Published online by Cambridge University Press:  04 August 2017

K. P. Simon  and
R. P. Kudritzki
K. P. Simon
Affiliation:
Institut für Astronomie und Astrophysik der Ludwig-Maximillians-Universität, München
R. P. Kudritzki
Affiliation:
Institut für Astronomie und Astrophysik der Ludwig-Maximillians-Universität, München

Abstract

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Non-LTE analyses of five very massive O-stars yield effective temperature, gravity and helium abundance of their photospheres. From these results together with photometric data an estimation of the stellar mass is possible. The comparison of the position in the log g — log Teff diagram relative to theoretical evolutionary tracks allows three compatibility-checks: (1) masses, (2) helium-abundance and (3) age of the stars. From these checks it is inferred, that (a) the stars are in an advanced main-sequence-phase, and (b) they have suffered from considerable mass-loss. Furthermore it seems to be likely that (c) mass-loss-rates do not scale with N > 200, (d) the age of the stars in the η Carinae region is less than 2 mio yrs., and (e) HD 93128 is in the background of Tr14.

Type
II. EVOLUTION OF MASSIVE STARS EVOLUTION AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 265 - 268
Copyright
Copyright © Reidel 1984 

References

Auer, L.H., Mihalas, D.: 1972, Astrophys. J. Suppl. 24, pp. 193–246 CrossRefGoogle Scholar
Conti, P.S., Frost, S.A.:1977, Astrophys. J. 212, pp. 728–742 Google Scholar
DeLoore, C., DeGreve, J.P., Vanbeveren, D.:1978, Astr. Astroph. 67, pp.373–379 Google Scholar
Kudritzki, R.P.:1976, Astron. Astrophys. 52, pp. 11–21 Google Scholar
Kudritzki, R.P.:1980, Astron. Astrophys. 85, pp. 174–183 Google Scholar
Kudritzki, R.P., Simon, K.P.:1978, Astron. Astrophys. 70, pp. 653–663 Google Scholar
Kudritzki, R.P., Simon, K.P., Hamann, W.R.:1983, Astr. Astroph. 118. pp.245–254 Google Scholar
Maeder, A.:1981, Astron. Astrophys. 99, pp.97–107 Google Scholar
Simon, K.P., Jonas, G., Kudritzki, R.P., Rahe, J.:83, Astr. Astroph. 125, pp.33–44 Google Scholar
Smith, L.F.:1968, Monthly Notices Roy. Astron. Soc. 138, pp.109–124 CrossRefGoogle Scholar
Walborn, N.R.:1971, Astrophys. J. 167, pp. L31–L33 Google Scholar