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The recently discovered eclipsing binary system TYC 2675-663-1 is a X-raysource, and shows properties in the optical that are similar to the W UMasystems, but are somewhat unusual compared to what is seen in other contactbinary systems. The goal of this work is to characterize its properties andinvestigate its nature by means of detailed photometric and spectroscopicobservations. We have performed extensive V-band photometric measurements withthe INTEGRAL satellite along with ground-based multi-band photometricobservations, as well as high-resolution spectroscopic monitoring from which wehave measured the radial velocities of the components. These data have beenanalysed to determine the stellar properties, including the absolute masses andradii. Additional low-resolution spectroscopy was obtained to investigatespectral features. From the measured eclipse timings we determine an orbitalperiod for the binary of P=0.4223576+-0.9 days. The light-curve andspectroscopic analyses reveal the observations to be well represented by amodel of an overcontact system composed of main-sequence F5 and G7 stars(temperature difference of nearly 1000 K), with the possible presence of athird star. Low-resolution optical spectroscopy reveals a complex H alphaemission, and other features that are not yet understood. The unusually largemass ratio of q=0.81+-0.05 places it in the rare "H" (high mass ratio) subclassof the W UMa systems, which are presumably on their way to coalescence.

TYC 2675-663-1: A newly discovered W UMa system in an active state