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Astron. Astrophys. 363, 1026-1028 (2000)
Research Note
Upper limits to the radio-fluxes of the Wolf-Rayet stars WR 46 (WN3p) and WR 50 (WC7+abs)
P.M. Veen 1 and
M.H. Wieringa 2
1 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
2 Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 2121, Australia
Received 1 September 2000 / Accepted 22 September 2000
Abstract
We have observed the Wolf-Rayet stars WR 46 (WN3p+c) and WR 50 (WC7+abs) at 3 and 6 cm using the Australia Telescope in search of non-thermal radio emission. However, the sources were not detected and we derive upper limits to their radio fluxes of 0.18 mJy (0.15 mJy in the case of WR 46 at 6 cm). These are not in conflict with expected thermal emission, because the wind densities have been found to be lower than an average WR wind. Inversely, assuming the mass-loss rate as determined from optical spectral analyses, the inferred lower limits to the distances are in agreement with previous determinations. Both objects are reported as short-period photometric variables, but we note that the variability of WR 50 is suspicious.
Key words: stars:
Wolf-Rayet 
stars: individual: WR 46 =
HD104994
stars: individual: WR
50
radio continuum: stars
Send offprint requests to: veen@strw.leidenuniv.nl
Contents
- 1. Introduction
- 2. Observations and reduction
- 3. Discussion
- 4. Conclusion
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: December 5, 2000
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