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Constraining convection across the AGB with high-angular-resolution observations

Published online by Cambridge University Press:  30 December 2019

Claudia Paladini Open the ORCID record for Claudia Paladini [Opens in a new window] ,
Fabien Baron ,
A. Jorissen ,
J.-B. Le Bouquin ,
B. Freytag ,
S. Van Eck Open the ORCID record for S. Van Eck [Opens in a new window] ,
M. Wittkowski ,
J. Hron Open the ORCID record for J. Hron [Opens in a new window] ,
A. Chiavassa  and
J.-P. Berger
...Show all authors
Claudia Paladini
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile email: cpaladin@eso.org
Fabien Baron
Affiliation:
Department of Physics and Astronomy, Georgia State University, PO Box 5060 Atlanta, Georgia 30302-5060, USA
A. Jorissen
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
J.-B. Le Bouquin
Affiliation:
Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Univ. Grenoble Alpes, France University of Michigan, 1085 S. University Ave. 303B West Hall Ann Arbor, USA
B. Freytag
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
S. Van Eck
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
M. Wittkowski
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
J. Hron
Affiliation:
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
A. Chiavassa
Affiliation:
Laboratoire Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte dAzur, BP 4229, 06304 Nice Cedex 4, France
J.-P. Berger
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
C. Siopis
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
A. Mayer
Affiliation:
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
G. Sadowski
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
K. Kravchenko
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium
S. Shetye
Affiliation:
Institut dAstronomie et dAstrophysique, Université libre de Bruxelles, CP 226, 1050 Bruxelles, Belgium Institute for Astronomy, KU Leuven, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium
F. Kerschbaum
Affiliation:
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
J. Kluska
Affiliation:
Institute for Astronomy, KU Leuven, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium
S. Ramstedt
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
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Abstract

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We present very detailed images of the photosphere of an AGB star obtained with the PIONIER instrument, installed at the Very Large Telescope Interferometer (VLTI). The images show a well defined stellar disc populated by a few convective patterns. Thanks to the high precision of the observations we are able to derive the contrast and granulation horizontal scale of the convective pattern for the first time in a direct way. Such quantities are then compared with scaling relations between granule size, effective temperature, and surface gravity that are predicted by simulations of stellar surface convection.

Keywords

convectionstars: AGB and post-AGBstars: imagingstars: mass losstechniques: high angular resolutiontechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 27 - 30
Copyright
© International Astronomical Union 2019 

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