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Recurrent Dust Formation by Wolf-Rayet Stars

Published online by Cambridge University Press:  03 August 2017

P.M. Williams ,
K.A. Van Der Hucht ,
P.S. Thé ,
P. Bouchet  and
G. Roberts
P.M. Williams
Affiliation:
1Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, United Kingdom
K.A. Van Der Hucht
Affiliation:
2SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
P.S. Thé
Affiliation:
3Astronomical Institute ‘Anton Pannekoek’, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands
P. Bouchet
Affiliation:
4European Southern Observatory, Karl-Schwarzschild-Strasse 2, D 8046 Garching bei München, F.R. Germany
G. Roberts
Affiliation:
5S.A. Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa

Abstract

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A number of Wolf-Rayet stars show variations of up to a factor of ten in their infrared emission on timescales of months to years while their photospheric luminosities remain unchanged. This can be interpreted in terms of variation in the rates at which dust grains form in their stellar winds. Our data show variable circumstellar dust emission from WR 70 (HD 137603), with an episode of enhanced dust formation in early 1989, and fading of emission by dust formed around WR 48a (in 1979) and WR 19 some time before our first observation in 1988. We consider their relation to WR 140 (HD 193793), which forms dust in its wind for a few months at intervals of 7.94 years.

Type
Session VI. Enrichment
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 417 - 420
Copyright
Copyright © Kluwer 1991 

References

REFERENCES

Danks, A.C., Dennefeld, M., Wamsteker, W. and Shaver, P.A., 1983. Astr. Astrophys. 118, 301.Google Scholar
Williams, P.M., van der Hucht, K.A., Pollock, A.M.T., Florkowski, D.R., van der Woerd, H. and Wamsteker, W.M., 1990. M.N.R.A.S. 243, 662.Google Scholar