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MERLIN observations of WR 147 (WN8(h)+B0.5V)

Published online by Cambridge University Press:  25 May 2016

Sarah K. Watson ,
Richard J. Davis  and
Peredur M. Williams
Sarah K. Watson
Affiliation:
NRAL, Jodrell Bank, University of Manchester, UK
Richard J. Davis
Affiliation:
NRAL, Jodrell Bank, University of Manchester, UK
Peredur M. Williams
Affiliation:
Royal Observatory, Blackford Hill, Edinburgh, UK

Extract

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WR147 was first discovered to be a strong radio, X-ray and infra-red emission source by Caillault et al. (1985). It was classified as a WN8 type star with a very large mass loss rate and unusual radio emission (α < 0) for a thermal source. This unusual behaviour was explained by MERLIN (Moran et al. 1989) and VLA (Churchwell et al. 1992) observations in which it was resolved into two components: a ‘thermal’ source associated with the Wolf-Rayet star and a non-thermal component ∼ 600 mas to the north. Churchwell et al. showed that the southern component had the expected spectral index of α ≃ 0.6 for free-free emission from a stellar wind. They also showed that the northern component had a spectral index of α ≃ −0.5 and was therefore a non-thermal source, now thought to be due to a colliding wind region.

Type
Part 3. Interaction of Wolf-Rayet stars and other hot massive stars with their environment: colliding winds and ring nebulae
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 396 - 397
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Caillault, J.-P., Chanan, G.A., Helfand, D.J., et al. 1985, Nature 313, 376 CrossRefGoogle Scholar
Churchwell, E.B, Bieging, J.H., van der Hucht, K.A., Williams, P.M., et al. 1992, ApJ 393, 329 CrossRefGoogle Scholar
Moran, J.P., Davis, R.J., Spencer, R.E., Bode, M.F., et al. 1989, Nature 340, 449 Google Scholar
Niemela, V.S, Shara, M.M., Wallace, D.J., Zurek, D.R., et al. 1998, AJ 115, 2047 Google Scholar
Williams, P.M., Dougherty, S.M., Davis, R.J., van der Hucht, K.A., et al. 1997, MNRAS 289, 10 Google Scholar