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Atmosphere tomography of red supergiant stars

Published online by Cambridge University Press:  23 May 2013

S. Lion ,
S. Van Eck ,
A. Chiavassa ,
B. Plez  and
A. Jorissen
S. Lion
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
S. Van Eck
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
A. Chiavassa
Affiliation:
Laboratoire Lagrange, UMR 7293, Observatoire de la Côte d’Azur, Université de Nice Sophia-Antipolis, Bd. de l’Observatoire, BP. 4229, 06304 Nice Cedex 4, France
B. Plez
Affiliation:
LUPM cc072, Université Montpellier II, 34095 Montpellier Cedex 5, France
A. Jorissen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
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Abstract

3-D simulations suggest that the atmospheres of red supergiants are subject to large-amplitude convective motions, which are suspected to generate supersonic motions and shocks. We perform tomography of supergiant-star atmospheres, on temporal series of high-resolution spectra and on 3-D hydrodynamical synthetic spectra. The tomographic technique is improved by the computation of the contribution function, which is used to construct numerical spectral masks probing different optical depths. This exploratory work allows us to put spatial and temporal constraints on velocity fields predicted by 3-D model atmospheres.

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. 85 - 92
Copyright
© EAS, EDP Sciences 2013

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