Volume 404, Number 2, June III 2003
|Page(s)||L29 - L32|
|Published online||02 June 2003|
Letter to the Editor
New type of brightness variations of the colliding wind WO4 + O5((f)) binary WR 30a*
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
2 SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
3 University of Groningen, Kapteyn Astronomical Institute, PO Box 800, 9700 AV, Groningen, The Netherlands
4 Astronomical Institute, PO Box 80000, 3508 TA Utrecht, The Netherlands
Corresponding author: K. A. van der Hucht, K.A.van.der.Hucht@sron.nl
Accepted: 16 April 2003
We present new photometric observations in Johnson V and B of WR 30a, revealing relative dramatic changes in brightness of . These variations occur on a time scale of hours, and are only seen in V. We argue that they are not caused by dust extinction, but either by a dramatic change in the strength of the C iv 5801-12 Å emission line doublet due to a de-excitation process, or by some unknown continuum effect.
Key words: stars: binaries / stars: Wolf-Rayet / stars: individual: WR 30a
© ESO, 2003
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