Abstract
Results are presented on 30 fiber-optic-echelle-CCD spectra for the UX Ari system, covering one orbit in the spring and two orbits in the fall of 1987. The spectra obtained have a resolution of about 12,000 over the range of the Ca II H lines in the near UV to the Ca II triplet in the near IR, covering several activity sensitive lines. The most striking features observed were strong H-alpha and H-beta absorption near phase 0.8, which were present at epochs eight months apart. The geometry of the system, as determined from the mass ratio, rotational velocities, and the assumption of synchronous rotation, gives a radius for the K star that is approximately filling its Roche lobe. It is suggested that the excess absorption seen is due to mass-transfer activity resulting from Roche lobe overflow of the K star and accretion onto the G star. 30 refs.
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