Abstract
We present long-slit intermediate resolution spectroscopy of the visual binary V1123. We confirm that component A is a W UMa eclipsing star with spectral type G0V, while component B is a K0V. We infer a distance to the system of 125 pc, and then a projected separation between both components of 520 AU. The difference in radial velocities of components A and B is ⩽20 km s −1. At the distance od the system, the flux measured by ROSAT for the component A, corresponds to an X-ray luminosity of L x = 30.23 erg s - 1 which is within typical values for W UMa systems.
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