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A HST imaging survey of a sample of 61 Galactic Wolf-Rayet stars — the WC8-9 subsample0

Published online by Cambridge University Press:  26 May 2016

Debra J. Wallace ,
Anthony F.J. Moffat ,
Michael M. Shara ,
Douglas R. Gies ,
Virpi S. Niemela  and
Edmund Nelan
Debra J. Wallace
Affiliation:
Center for High Angular Resolution Astronomy, Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA
Anthony F.J. Moffat
Affiliation:
Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montreal, QC H3C 3J7, Canada
Michael M. Shara
Affiliation:
Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA
Douglas R. Gies
Affiliation:
Center for High Angular Resolution Astronomy, Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA
Virpi S. Niemela
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina
Edmund Nelan
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Abstract

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A HST-wfpc2 survey of Galactic Wolf-Rayet stars was undertaken over a five year period, in an effort to discover new close visual companions, tight clusters, and/or association memberships. In total, 61 Galactic WR stars were observed, with nine objects being members of the subclasses WC8 and WC9, which are associated with dust production. For these nine, we present images of WR 11, WR 48a, WR 69, WR 70, WR 81, and WR 92. We refer to Wallace et al. (2002) for discussion of WR 98a, WR 104, and WR 112. Overall, we find for separations of approximately ≥ 150 mas, that the binary/association properties of the WC8/WC9 sample are statistically indistinguishable from the overall WR population. These statistics are limited, however, by the small numbers of each WR subclass observed.

Type
Part 3. Location and Distribution of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 578 - 580
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Stetson, P.B. 1987, PASP 99, 191.Google Scholar
van der Hucht, K.A. 2001, New Astron. Reviews 45, 135.Google Scholar
Wallace, D.J., Moffat, A.F.J., Shara, M.M. 2002, in: Moffat, A.F.J. & St-Louis, N. (eds.), Interacting Winds from Massive Stars, ASP-CS 260, 407.Google Scholar