The Massive Wolf-Rayet Binary SMC WR7

Details The Massive Wolf-Rayet Binary SMC WR7 The Massive Wolf-Rayet Binary SMC WR7

2002-02-11

arxiv.org/abs/astro-ph/0202203v1

Mon.Not.Roy.Astron.Soc. 333 (2002) 347

Astronomy and Astrophysics

Astrophysics

Accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05395.x

We present a study of optical spectra of the Wolf--Rayet star AzV 336a (= SMC WR7) in the Small Magellanic Cloud. Our study is based on data obtained at several Observatories between 1988 and 2001. We find SMC WR7 to be a double lined WN+O6 spectroscopic binary with an orbital period of 19.56 days. The radial velocities of the He absorption lines of the O6 component and the strong He{\sc ii} emission at $\lambda$4686\AA of the WN component describe antiphased orbital motions. However, they show a small phase shift of $\sim$ 1 day. We discuss possible explanations for this phase shift. The amplitude of the radial velocity variations of He {\sc ii} emission is twice that of the absorption lines. The binary components have fairly high minimum masses, $\sim$ 18 $\modot$ and 34 $\modot$ for the WN and O6 components, respectively.

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