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Improved Non-LTE Model Atmospheres for Subluminous O-Stars

Published online by Cambridge University Press:  19 July 2016

U. Heber ,
K. Hunger ,
T. Rauch  and
K. Werner
U. Heber
Affiliation:
Institut für Theoretische Physik und Sternwarte, Olshausenstr. 40, D2300 Kiel 1, Federal Republic of Germany
K. Hunger
Affiliation:
Institut für Theoretische Physik und Sternwarte, Olshausenstr. 40, D2300 Kiel 1, Federal Republic of Germany
T. Rauch
Affiliation:
Institut für Theoretische Physik und Sternwarte, Olshausenstr. 40, D2300 Kiel 1, Federal Republic of Germany
K. Werner
Affiliation:
Institut für Theoretische Physik und Sternwarte, Olshausenstr. 40, D2300 Kiel 1, Federal Republic of Germany

Abstract

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Improved non-LTE model atmospheres designed for the analysis of very hot subluminous O stars are presented. The calculations are based on the new method of the accelerated lambda iteration (ALI) which proves capable of treating up to 100 levels of various ions. Presented here are improved calculations for (i) pure hydrogen model atmospheres including Stark broadening, (ii) for hydrogen- and helium-composed model atmospheres and (iii) first preliminary models which include in addition a detailed carbon model atom. These models remove an apparent mismatch of Balmer line profiles noted previously and fit high S/N, high-resolution hydrogen and helium spectra obtained with the ESO-Cassegrain echelle spectrograph very well.

Type
III. Stars
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 117 - 122
Copyright
Copyright © Kluwer 1988 

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