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Proceedings Paper

Wolf-Rayet stars probed by AMBER/VLTI
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Paper Abstract

Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observations, although evidence of geometrical complexity of their wind are numerous. Interferometry can provide spatially resolved observations of massive stars and their immediate vicinity. Specific geometries (disks, jets, latitude-dependent winds) can be probed by this technique. The first observation of a Wolf-Rayet (WR) star (γ2 Vel) with the AMBER/VLTI instrument yielded to a re-evaluation of its distance and an improved characterization of the stellar components, from a very limited data-set. This motivated our team to increase the number of WR targets observed with AMBER. We present here new preliminary results that encompass several spectral types, ranging from early WN to evolved dusty WC. We present unpublished data on WR79a, a massive star probably at the boundary between the O and Wolf-Rayet type, evidencing some Wolf-Rayet broad emission lines from an optically thin wind. We also present new data obtained on γ2 Vel that can be compared to the up-to-date interferometry-based orbital parameters from North et al. (2007). We discuss the presence of a wind-wind collision zone in the system and provide preliminary analysis suggesting the presence of such a structure in the data. Then, we present data obtained on 2 dusty Wolf-Rayet stars: WR48a-b and WR118, the latter exhibiting some clues of a pinwheel-like structure from the visibility variations.

Paper Details

Date Published: 28 July 2008
PDF: 9 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70130T (28 July 2008); doi: 10.1117/12.788719
Show Author Affiliations
Florentin Millour, Max-Planck Institut for Radioastronomy (Germany)
Olivier Chesneau, Fizeau Lab., Nice Univ. (France)
Thomas Driebe, Max-Planck Institut for Radioastronomy (Germany)
Romain G. Petrov, Fizeau Lab., Nice Univ. (France)
Daniel Bonneau, Fizeau Lab., Nice Univ. (France)
Luc Dessart, Steward Observatory (United States)
Karl-Heinz Hofmann, Max-Planck Institut for Radioastronomy (Germany)
Gerd Weigelt, Max-Planck Institut for Radioastronomy (Germany)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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