Sion and J-E. Solheim (Tromso, Norway) have carried out IUE high resolution observations and analysis of helium transfer cataclysmics and their relation to the genesis of single helium-rich white dwarfs. Many pulsational and photometric characteristics suggest a link between the accreting central object in AM CVn systems and single DB and DO white dwarfs. DOs(DBs). Further progress requires the large mirror of HST. Their cycle 5 HST project has just begun.
Research on white dwarfs and cataclysmic variables during the report period at Villanova was supported by NASA LTSA grant NAGW5-3726, NASA HST grants GO3836.01-191a, GO5412.01-191A, by NSF grant AST90-16283, NASA IUE grant NAG5-343 and a summer grant from the Delaware Space Grant Colleges Consortium.