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The first orbital solution for the massive colliding-wind binary HD 93162 (? WR 25)
Since the discovery, with EINSTEIN, of strong X-ray emission associatedwith HD 93162, this object was recurrently predicted by some authors tobe a colliding-wind binary system. However, radial-velocity variationsthat would prove the suspected binary nature have never been found sofar. We spectroscopically monitored this object in order to investigateits possible variability and to provide an answer to the above-mentioneddiscordance. We derived radial velocities from spectroscopic dataacquired mainly between 1994 and 2006, and searched for periodicities.For the first time, periodic radial-velocity variations are detected.Our analysis definitively shows that the Wolf-Rayet star WR 25 isactually an eccentric binary system with a probable period of about 208days.
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