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Astron. Astrophys. 335, 227-233 (1998)

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A new cataclysmic variable RX J0757.0+6306: candidate for the shortest period intermediate polar

G.H. Tovmassian 1, J. Greiner 2, P. Kroll 3, P. Szkody 4, P.A. Mason 5, F.-J. Zickgraf 2, 6, J. Krautter 6, I. Thiering 6, A. Serrano 7, S. Howell 8 and D.R. Ciardi 8

1 Instituto de Astronomía, UNAM, Ensenada, B.C., México
2 MPI für Extraterrestrische Physik, D-85740 Garching, Germany
3 Sternwarte Sonneberg, D-96515 Sonneberg, Germany
4 University of Washington, Seattle, Washington, USA
5 NMSU, Las Cruces, New Mexico, USA
6 Landessternwarte Königstuhl, Heidelberg, Germany
7 INAOE, Puebla, Mexico
8 University of Wyoming, Laramie, Wyoming, USA

Received 18 February 1998 / Accepted 19 March 1998


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 [FORMULA]  min. We identify this period as the orbital period of the binary system. CCD photometry reveals an additional period of 8.52 [FORMULA] 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.

Key words: stars: individual: RX J0757.0+6306 – stars: novae, cataclysmic variables – X-rays: stars

Present address: Astrophysical Institute Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Present address: Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France

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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998