Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2B016

First Images from the PIONIER/VLTI optical interferometry imaging survey of Herbig Ae/Be stars

Kluska, Jacques (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Malbet, Fabien (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Berger, Jean-Philippe (ESO, Garching, Germany)
Benisty, Myriam (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Lazareff, Bernard (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Le Bouquin, Jean-Baptiste (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Baron, Fabien (Georgia State University, USA)
Dominik, Carsten (University of Amsterdam, The Netherlands)
Isella, Andrea (Calinfornia Institute of Technology, USA)
Juhasz, Attila (Leiden Observatory, The Netherlands)
Kraus, Stefan (University of Exeter, UK)
Lachaume, Régis (Centro de Astroingeniería, Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile)
Ménard, François (UMI-FCA, CNRS y U. de Chile, Chile)
Millan-Gabet, Rafael (Calinfornia Institute of Technology, USA)
Monnier, John (University of Michigan, USA)
Pinte, Christophe (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Thi, Wing-Fai (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)
Thiébaut, Eric (University of Lyon 1, France)
Zins, Gérard (Institut de Planétologie et d’Astrophysique de Grenoble, UJF, CNRS, 414 rue de la piscine, 38400 Saint Martin d’Hères, France)

Abstract:
The morphology of the close environment of herbig stars is being revealed step by step and appears to be quite complex. Many physical phenomena could interplay : the dust sublimation causing a puffed-up inner rim, a dusty halo, a dusty wind or an inner gaseous component. To investigate more deeply these regions, getting images at the first Astronomical Unit scale is crucial. This has become possible with near infrared instruments on the VLTi. We are carrying out the first Large Program survey of HAeBe stars with statistics on the geometry of these objects at the first astronomical unit scale and the first images of the very close environment of some of them. We have developed a new numerical method specific to young stellar objects which removes the stellar component reconstructing an image of the environment only. To do so we are using the differences in the spectral behaviour between the star and its environment. The images reveal the environement which is not polluted by the star and allow us to derive the best fit for the flux ratio and the spectral slope between the two components (stellar and environmental). We present the results of the survey with some statistics and the frist images of Herbig stars made by PIONIER on the VLTi.

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