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Exploring the water and carbon monoxide shell around Betelgeusewith VLTI/AMBER

Published online by Cambridge University Press:  23 May 2013

M. Montargès ,
P. Kervella ,
G. Perrin  and
K. Ohnaka
M. Montargès
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France
P. Kervella
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France
G. Perrin
Affiliation:
LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France
K. Ohnaka
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
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Abstract

We present the results of the analysis of our recent interferometric observations ofBetelgeuse, using the AMBER instrument of the VLTI. Using the medium spectral resolutionmode (R ~ 1500) we detected the presence of the water vapour andcarbon monoxide (CO) molecules in the H and K bands. We also derived the photosphericangular diameter in the continuum. By analysing the depth of the molecular lines and theinterferometric visibilities, we derived the column densities of the molecules, as well asthe temperature and the size of the corresponding regions in the atmosphere of Betelgeuse(the MOLsphere) using a single shell model around the photosphere. Our results confirm thefindings by Perrin et al. (2004)and Ohnaka et al. (2011) that theH2O and CO molecules are distributed around Betelgeuse in a MOLsphereextending to approximately 1.3 times the star’s photospheric radius.

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