  From radial velocities derived from optical spectroscopic observations
performed at CTIO, Chile, and CASLEO, Argentina, we have discovered that LSS
1135 is a single--lined O-type binary system with an orbital period of 2.7532
days. We present an analysis of the orbital elements of this system based on
radial velocities of the He absorption lines. We classify the spectrum of LSS
1135 as O6.5V((f)). We also present spectral classifications and radial
velocities for other seven OB stars in the region of Bochum 7, an OB
association to which LSS 1135 belongs. Our data indicate a distance of 5.0 kpc
for this star group.
