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Astron. Astrophys. 339, L45-L48 (1998)

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Letter to the Editor

A second dust episode of the Wolf-Rayet system WR 19:
another long-period WC+O colliding-wind binary *

P.M. Veen 1, K.A. van der Hucht 2, P.M. Williams 3, R.M. Catchpole 4, M.F.J. Duijsens 2, I.S. Glass 5 and D.Y.A. Setia Gunawan 2, 6

1 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands (e-mail: veen@strw.leidenuniv.nl)
2 Space Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands (e-mail: K.A.van.der.Hucht@sron.nl)
3 Royal Observatory, Blackford Hill, Edingburgh EH9 3HJ, Scotland, UK (e-mail: pmw@roe.ac.uk)
4 Royal Greenwich Observatory, Madingley Road, Cambridge CB3 OEZ, UK (e-mail: catchpol@ast.cam.ac.uk)
5 South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa (e-mail: isg@saao.ac.za)
6 Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands (e-mail: diah@astro.rug.nl)

Received 15 September 1998 / Accepted 5 October 1998


We present observations of WR 19 showing an infrared excess due to newly created dust similar to an event observed in 1988. We suggest that these episodes of dust-formation are periodic ([FORMULA]yr) and related to the binary nature of the object, comparable to the colliding-wind binary WR 140. In support of this thesis we identified absorption lines from a companion of spectral type O9.5-9.7. We propose monitoring the object to determine orbital parameters, non-thermal radio emission and the accurate shape of the infrared light-curve.

Key words: stars: Wolf-Rayet – stars: individual: WR 19, HD 96620 – binaries: general – infrared: stars

* Based on observations collected at the European Southern Observatory (ESO), La Silla, Chile and the South African Astronomical Observatory (SAAO)

Send offprint requests to: P.M. Veen

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© European Southern Observatory (ESO) 1998

Online publication: October 21, 1998