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NLTE-Effects in Profiles of Paschen and Brackett Lines of an AOIV Star γGem

Published online by Cambridge University Press:  19 July 2016

A. A. Chalabaev ,
J. Borsenberger ,
J. P. Maillard  and
F. Praderie
A. A. Chalabaev
Affiliation:
CNRS, Observatoire de Haute-Provence, F-04870, Saint-Michel-l'Observatoire, France
J. Borsenberger
Affiliation:
Observatoire de Paris, Section de Meudon, F-92195, Meudon, France
J. P. Maillard
Affiliation:
CNRS, Institut d'Astrophysyque, 98bis bd Arago, F-75014, Paris, France
F. Praderie
Affiliation:
Observatoire de Paris, Section de Meudon, F-92195, Meudon, France

Abstract

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Profiles of the hydrogen Paß, Paγ and Brγ lines of an A0IV star γ Gem were obtained at a high resolution to investigate at what degree the hydrogen IR lines can be useful for fine tests of the NLTE model atmospheres. All three lines show a deep and narrow absorption core in a good qualitative agreement with the predictions of the available NLTE models for B stars, thus proving that the NLTE effects are important for A stars as well. New NLTE models were computed to extend the grid down to 9500 °K and to include 8 discrete levels of H atom into the energy balance. However, further theoretical work is necessary to compare the observed profiles and the theory.

Type
III. Stars
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 139 - 142
Copyright
Copyright © Kluwer 1988 

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