Abstract
The authors are performing a long-term observing program searching for spectroscopic binaries among the brightest and earliest type stars in both Magellanic Clouds, in order to improve our knowledge of the fundamental parameters of these stars to compare them with similar determinations in our own Galaxy. The project involves both spectral and direct CCD imaging which are being carried out at the observatories of CASLEO (San Juan, Argentina), La Plata (Argentina), and CTIO (Chile). The authors present here results for 5 stars in the Large Magellanic Cloud, including; (1) a new determination of the orbital parameters of Sk -67°105, a double-lined O4 f+O6: V spectroscopic binary showing light variations as well; (2) the first orbital solution for Sk -66°35, a blue supergiant in the H II region N11: (3) the discovery of a new double-lined eclipsing binary in the OB association LH 4; (4) radial velocity measurements for Sk -67°211, an O3 III star suspected of being a multiple system; (5) radial velocity measurements for Sk -71°42, a B1 Ia supergiant with probably constant radial velocity.
