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Evidences for a large hot spot on the disk of Betelgeuse (α Ori)

Published online by Cambridge University Press:  23 January 2015

M. Montargès ,
P. Kervella ,
G. Perrin ,
A. Chiavassa  and
J. B. Le Bouquin
M. Montargès
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France email: [email protected]
P. Kervella
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France email: [email protected]
G. Perrin
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France email: [email protected]
A. Chiavassa
Affiliation:
Laboratoire Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
J. B. Le Bouquin
Affiliation:
UJF-Grenoble 1 /CNRS-INSU, Institut de Planétologie et dAstrophysique de Grenoble (IPAG) UMR 5274, Grenoble, France
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Abstract

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Massive evolved stars contribute to the chemical enrichment of the Galaxy. When they die as supernova but also through their mass loss during the several thousands of years of their red supergiant (RSG) phase. Unfortunately the mass loss mechanism remains poorly understood. Detailed study of the CSE and photosphere of nearby RSGs is required to constrain this scenario.

Betelgeuse is the closest RSG (197 pc) and therefore has a large apparent diameter (~ 42 mas) which makes it a very interesting target. For several years, our team has lead a multi-wavelength and multi-scale observing program to characterize its mass loss. We will review here our recent results in near-infrared interferometry.

Keywords

stars: individual: Betelgeusesupergiantsstars: late-typetechniques: interferometricinfrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 273 - 279
Copyright
Copyright © International Astronomical Union 2015 

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