Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...384.1012p&link_type=abstract
Astronomy and Astrophysics, Vol. 384, p. 1012-1022 (2002)
Astronomy and Astrophysics
Astrophysics
4
Stars: Binaries: General, Stars: Wolf-Rayet, Stars: Individual: Wr 86
Scientific paper
We discuss the variability of WR 86 (WC7 (+B0 III)), a known visual binary, confirmed by Hubble Space Telescope observations (Niemela et al. \cite{niemela}). Photometric observations show a fairly smooth light curve with a time scale of ~3.5 h and a light amplitude of ~0.01m. 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, 6.914: cd-1 and 7.236: cd-1, where only the latter is given in the recent VIIth catalogue of galactic Wolf-Rayet stars (van der Hucht \cite{hucht}). 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 20 Msolar β-Cephei star in combination with a WR star of initial mass 40 Msolar, at Z=0.04. We derive a distance to WR 86 of 2.1 ± 0.8 kpc.
Paardekooper Sijme-Jan
van der Hucht Karel A.
van Genderen Arnout M.
Veen Pieter Maarten
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