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High spatial resolution monitoring of the activity of BA supergiant winds

Published online by Cambridge University Press:  12 July 2011

Olivier Chesneau ,
Luc Dessart ,
Andreas Kaufer ,
Denis Mourard ,
Otmar Stahl ,
Raman K. Prinja  and
Stan P. Owocki
Olivier Chesneau
Affiliation:
UMR 6525 H. Fizeau, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Av. Copernic, F-06130 Grasse, France email: olivier.chesneau@oca.eu
Luc Dessart
Affiliation:
Laboratoire d'Astrophysique de Marseille, Université de Provence, CNRS, 38 rue Frédéric Joliot-Curie, F-13388 Marseille Cedex 13, France
Andreas Kaufer
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
Denis Mourard
Affiliation:
UMR 6525 H. Fizeau, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Av. Copernic, F-06130 Grasse, France email: olivier.chesneau@oca.eu
Otmar Stahl
Affiliation:
Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, 69117 Heidelberg, Germany
Raman K. Prinja
Affiliation:
Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
Stan P. Owocki
Affiliation:
Bartol Research Institute, Dept. of Physics & Astronomy, Univ. of Delaware Newark, DE 19716USA
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Abstract

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There are currently two optical interferometry recombiners that can provide spectral resolutions better than 10000, AMBER/VLTI operating in the H-K bands, and VEGA/CHARA, recently commissioned, operating in the visible. These instruments are well suited to study the wind activity of the brightest AB supergiants in our vicinity, in lines such as Hα or Brγ. We present here the first observations of this kind, performed on Rigel (B8Ia) and Deneb (A2Ia). Rigel was monitored by AMBER in two campaigns, in 2006-2007 and 2009-2010, and observed in 2009 by VEGA; whereas Deneb was monitored in 2008-2009 by VEGA. The extension of the Hα and Brγ line forming regions were accurately measured and compared with CMFGEN models of both stars. Moreover, clear signs of activity were observed in the differential visibility and phases. These pioneer observations are still limited, but show the path for a better understanding of the spatial structure and temporal evolution of localized ejections using optical interferometry.

Keywords

techniques: high angular resolutionstars: activitystars: mass lossstars: individual (HD 34085, HD 197345)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 342 - 347
Copyright
Copyright © International Astronomical Union 2011

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