| Issue |
A&A
Volume 404, Number 2, June III 2003
|
|
|---|---|---|
| Page(s) | L29 - L32 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20030574 | |
| Published online | 02 June 2003 | |
Letter to the Editor
New type of brightness variations of the colliding wind WO4 + O5((f)) binary WR 30a*
1
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
Received:
13
March
2003
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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