We present the discovery of OB type absorption lines superimposed to the emission line spectrum and the first double-lined orbital elements for the massive Wolf-Rayet binary HDE 318016 ( =WR 98 ) , a spectroscopic binary in a circular orbit with a period of 47.825 days .
The semiamplitudes of the orbital motion of the emission lines differ from line to line , indicating mass ratios between 1 and 1.7 for \mathcal { M } _ { WR } / \mathcal { M } _ { OB } .