Abstract. We present the results of photometric and spectroscopic observations obtained between 1980 and 1996, which show that the bright star Sk −67 • 18 in the Large Magellanic Cloud (LMC) is a multiple star which contains an eclipsing binary system. Our spectra show that this is an Of + O type binary, where the primary is probably of type O3f * . The orbital period of the eclipsing binary is almost exactly 2 days, which considerably compromises the obtaining of data with suitable phase coverage. Furthermore, from our radial velocity analysis of the spectral lines, Sk −67 • 18 appears to be a multiple system consisting of at least two pairs of short-period binaries.

Abstract. We present photometric and astrometric data of about 280 visual double stars of the "intermediate" class, i.e. with angular separations mainly in the range 2 < ρ < 12 . The observations have been obtained in 1991-92 with a CCD camera attached to the 91 cm Dutch telescope at ESO La Silla, Chile. Differential magnitudes of the double star components as well as magnitudes and colour indices of the individual components have been determined in the Cousins V and I passbands with an internal error of about 0.005 mag and an external accuracy of less than 0.03 mag. In addition, angular separations have been secured to an internal accuracy of 0.004 and position angles to about 0.05•1 .

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