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Astron. Astrophys. 328, 269-273 (1997)

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

C. Sterken ** 1 and J. Breysacher 2

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

Received 22 May 1997 / Accepted 29 July 1997

Abstract

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 [FORMULA]. 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: March 24, 1998

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