Volume 384, Number 3, March IV 2002
|Page(s)||1012 - 1022|
|Section||Interstellar and circumstellar matter|
|Published online||15 March 2002|
On the variability of the visual binary WR 86*
WC7 with a β-Cephei companion
Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
2 SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Corresponding author: A. M. van Genderen, firstname.lastname@example.org
Accepted: 15 January 2002
We discuss the variability of WR 86 (WC7 (+B0 III)), a known visual binary, confirmed by Hubble Space Telescope observations (Niemela et al. [CITE]). Photometric observations show a fairly smooth light curve with a time scale of ~3.5 h and a light amplitude of . Because of the spectral classification of the visual companion (B0 III) it might well be a β-Cephei star. From observations taken in 1989, 1990 and 1995 we derive two photometric frequencies, and , where only the latter is given in the recent VIIth catalogue of galactic Wolf-Rayet stars (van der Hucht [CITE]). Our spectroscopy reveals a slightly variable WR star and almost certainly a pulsating companion. Comparison with stellar models suggests that WR 86 consists of a β-Cephei star in combination with a WR star of initial mass , at . We derive a distance to WR 86 of kpc.
Key words: stars: binaries: general / stars: Wolf-Rayet / stars: individual: WR 86
© ESO, 2002
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