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Imaging “Pinwheel” nebulae with optical long-baseline interferometry

Published online by Cambridge University Press:  12 July 2011

Florentin Millour ,
Thomas Driebe ,
Jose H. Groh ,
Olivier Chesneau ,
Gerd Weigelt ,
Adriane Liermann  and
Anthony Meilland
Florentin Millour
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu Observatoire de la côte d'Azur, Bd de l'Observatoire, 06304 Nice, France
Thomas Driebe
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu German Aerospace Center (DLR), Königswinterer Str. 522-524, 53227 Bonn, Germany
Jose H. Groh
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu
Olivier Chesneau
Affiliation:
Observatoire de la côte d'Azur, Bd de l'Observatoire, 06304 Nice, France
Gerd Weigelt
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu
Adriane Liermann
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu
Anthony Meilland
Affiliation:
Max-Planck Institute for Radioastronomy, auf dem Hügel 69, 53121 Bonn, Germany email: fmillour@oca.eu
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Abstract

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Dusty Wolf-Rayet stars are few but remarkable in terms of dust production rates (up to Ṁ = 10−6 M⊙/yr). Infrared excesses associated to mass-loss are found in the sub-types WC8 and WC9. Few WC9d stars are hosting a “pinwheel” nebula, indirect evidence of a companion star around the primary. While few other WC9d stars have a dust shell which has been barely resolved so far, the available angular resolution offered by single telescopes is insufficient to confirm if they also host “pinwheel” nebulae or not. In this article, we present the possible detection of such nebula around the star WR 118. We discuss about the potential of interferometry to image more “pinwheel” nebulae around other WC9d stars.

Keywords

techniques: high angular resolutiontechniques: interferometricbinaries (including multiple): closestars: individual (WR 118)stars: windsoutflowsstars: Wolf-Rayet
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. 408 - 409
Copyright
Copyright © International Astronomical Union 2011

References

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