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From radial velocities derived from optical spectroscopic observationsperformed at CTIO, Chile, and CASLEO, Argentina, we have discovered that LSS1135 is a single--lined O-type binary system with an orbital period of 2.7532days. We present an analysis of the orbital elements of this system based onradial velocities of the He absorption lines. We classify the spectrum of LSS1135 as O6.5V((f)). We also present spectral classifications and radialvelocities for other seven OB stars in the region of Bochum 7, an OBassociation to which LSS 1135 belongs. Our data indicate a distance of 5.0 kpcfor this star group.Comment: 5 pages, 4 figures, many tables, uses aa.cls version 4.05. Accepted  for publication in A&

LSS 1135: An O-type spectroscopic binary in the galactic OB association Bochum 7