A 486-H PERIODIC MODULATION IN THE UV RESONANCE LINES OF THE CATACLYSMIC VARIABLE V-795 HERCULIS

Low-resolution IUE spectroscopy of V795 Her secured in 1992 August is used to authenticate the presence of a approximately 4.86-h periodic v ariation in the mainly wind-formed Si IV lambda 1400 and C IV lambda 1 549 resonance lines. The modulation is demonstrated to be coherent ac ross a 3-yr time-span, and is discordant with the mooted orbital (opti cal spectroscopic) period of approximately 2.60 h. Constraints are dis cussed for some possible configurations of the system that introduce a symmetries and can potentially yield modulated profile variability. Th e first ROSAT X-ray detection of V795 Her is also described.