A New Cataclysmic Variable RX J0757.0+6306: Candidate for the Shortest   Period Intermediate Polar
  A new cataclysmic variable is identified as the optical counterpart of the faint and hard X-ray source RX J0757.0+6306 discovered during the ROSAT all-sky survey. Strong double-peaked emission lines bear evidence of an accretion disc via an S-wave which varies with a period of 81 +/- 5 min. We identify this period as the orbital period of the binary system. CCD photometry reveals an additional period of 8.52 +/- 0.15 min. which was stable over four nights. We suggest that RX J0757.0+6306 is possibly an intermediate polar, but we cannot exclude the possibility that it is a member of the SU UMa group of dwarf novae. 
G.H. Tovmassian (UNAM Mexico), J. Greiner (AIP Potsdam, Germany), P.   Kroll (Sonneberg), P. Szkody (Univ. Washington), P.A....