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NLTE analysis of SDO stars

Published online by Cambridge University Press:  04 August 2017

U. Heber ,
K. Hunger ,
R.P. Kudritzki  and
K. P. Simon
U. Heber
Affiliation:
Institut für Theor. Physik und Sternwarte, Kiel
K. Hunger
Affiliation:
Institut für Theor. Physik und Sternwarte, Kiel
R.P. Kudritzki
Affiliation:
Institut für Astronomie und Astrophysik, München
K. P. Simon
Affiliation:
Institut für Astronomie und Astrophysik, München

Extract

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Among the faint blue halo stars the sdO's form a group whose evolutionary status is still not fully understood. Phenomenologically they appear to be related to the horizontal branch. The knowledge of stellar parameters and abundances may give a clue for understanding their evolutionary status. As the sdO's are hot (Teff ≥ 35000K), the assumption of LTE leads to substantial errors. Hence detailed NLTE analyses are inevitable.

Type
I. EVOLUTION OF LOW AND INTERMEDIATE MASS STARS OBSERVATIONS AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 215 - 218
Copyright
Copyright © Reidel 1984 

References

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Kudritzki, R.P., Simon, K.P.: 1978, Astron. Astrophys. 70, 653 Google Scholar
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