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Long-term spectropolarimetric monitoring of the cool supergiant betelgeuse

Published online by Cambridge University Press:  23 May 2013

I. Bedecarrax ,
P. Petit ,
M. Aurière ,
J. Grunhut ,
G. Wade ,
A. Chiavassa ,
J.-F. Donati ,
R. Konstantinova-Antova  and
G. Perrin
I. Bedecarrax
Affiliation:
IRAP, Université de Toulouse, CNRS, Toulouse, France
P. Petit
Affiliation:
IRAP, Université de Toulouse, CNRS, Toulouse, France
M. Aurière
Affiliation:
IRAP, Université de Toulouse, CNRS, Toulouse, France
J. Grunhut
Affiliation:
ESO, Garching bei München, Germany
G. Wade
Affiliation:
Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada
A. Chiavassa
Affiliation:
Laboratoire Lagrange, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d’Azur, Nice, France
J.-F. Donati
Affiliation:
IRAP, Université de Toulouse, CNRS, Toulouse, France
R. Konstantinova-Antova
Affiliation:
Institute of Astronomy and NAO, Bulgarian Academy of Sciences, Sofia, Bulgaria
G. Perrin
Affiliation:
Observatoire de Paris, LESIA, Meudon, France
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Abstract

We report on a long-term monitoring of the cool supergiant Betelgeuse, using the NARVAL and ESPaDOnS high-resolution spectropolarimeters, respectively installed at Telescope Bernard Lyot (Pic du Midi Observatory, France) and at the Canada-France-Hawaii Telescope (Mauna Kea Observatory, Hawaii). The data set, constituted of circularly polarized (Stokes V) and intensity (Stokes I) spectra, was collected between 2010 and 2012. We investigate here the temporal evolution of magnetic field, convection and temperature at photospheric level, using simultaneous measurements of the longitudinal magnetic field component, the core emission of the Ca II infrared triplet, the line-depth ratio of selected photospheric lines and the radial velocity of the star.

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. 161 - 165
Copyright
© EAS, EDP Sciences 2013

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