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Astron. Astrophys. 363, 1026-1028 (2000)


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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

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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