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NLTE water lines in Betelgeuse-like atmospheres

Published online by Cambridge University Press:  23 May 2013

J. Lambert ,
E. Josselin ,
N. Ryde  and
A. Faure
J. Lambert
Affiliation:
LUPM, UMR 5299, CNRS & Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France. e-mail: Julien.Lambert@astro.lu.se ; Lund Observatory, Box 43, 22100 Lund, Sweden
E. Josselin
Affiliation:
LUPM, UMR 5299, CNRS & Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France. e-mail: Julien.Lambert@astro.lu.se ;
N. Ryde
Affiliation:
Lund Observatory, Box 43, 22100 Lund, Sweden
A. Faure
Affiliation:
IPAG, UMR 5274, CNRS & UJF-Grenoble, 38041 Grenoble, France
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Abstract

The interpretation of water lines in red supergiant stellar atmospheres has been much debated over the past decade. The introduction of the so-called MOLspheres to account for near-infrared “extra” absorption has been controversial. We propose that non-LTE effects should be taken into account before considering any extra-photospheric contribution.

After a brief introduction on the radiative transfer treatment and the inadequacy of classical treatments in the case of large-scale systems such as molecules, we present a new code, based on preconditioned Krylov subspace methods. Preliminary results suggest that NLTE effects lead to deeper water bands, as well as extra cooling.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 60: Betelgeuse Workshop 2012 The Physics of Red Supergiants: Recent Advances and Open Questions , 2013 , pp. 111 - 119
Copyright
© EAS, EDP Sciences 2013

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