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Astron. Astrophys. 328, 269-273

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Photometric variability of the SMC W-R binary HD 5980*

C. Sterken1,** and J. Breysacher2

1University of Brussels (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
2European Southern Observatory, Karl-Schwarzschildstrasse 2, D-85748 Garching, Germany

Received 22 May 1997 / Accepted 29 July 1997


We present the results of a photometric monitoring campaign of the W-R binary HD 5980 conducted in November-December 1995, 16 months after the LBV-like outburst of one of the components of the system. On the basis of almost 800 y-band measurements, an improved orbital ephemeris is derived. We also report the discovery of a coherent 6 h periodic oscillation visible in the Strömgren b and y bands with amplitudes $\sim 0\hbox{$.\!\!^{\rm m}$}025$. This short period may be related to pulsations of the primary or secondary component.

Key words: binaries: eclipsing - stars: oscillations - stars: Wolf-Rayet - stars: individual: HD 5980

*Based on observations obtained at the European Southern Observatory at La Silla, Chile (observing proposals ESO 56-D0392 and 56-D0249).
**Belgian Fund for Scientific Research (FWO)

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© European Southern Observatory (ESO) 1997

Online publication: October 30, 1997
Last change: March 24, 1998