An eclipse of the X-ray flux from the dwarf nova OY Carinae in quiescence

We present a phase-resolved ROSAT HRI X-ray light curve of the dwarf nova OY Car in quiescence. The X-ray flux is eclipsed at the same time as the optical eclipse of the primary, and the region of X-ray emission is comparable in size to the white dwarf. We use subsequent optical observations to update the orbital ephemeris of the system.

[1]  Tim Naylor,et al.  The X-Ray Eclipse of the Dwarf Nova HT Cassiopeiae: Results from ASCA and ROSAT HRI Observations , 1997 .

[2]  James H. Applegate,et al.  A Mechanism for Orbital Period Modulation in Close Binaries , 1992 .

[3]  G. Sonneborn,et al.  The 1985 May superoutburst of the dwarf nova OY Carinae. II - IUE and Exosat observations , 1988 .

[4]  K. Horne,et al.  HST eclipse mapping of dwarf nova OY Carinae in quiescence: An 'Fe II curtain' with Mach approx. = 6 velocity dispersion veils the white dwarf , 1994 .

[5]  Graham Berriman,et al.  Eclipse studies of the dwarf nova OY Carinae in quiescence , 1989 .

[6]  J. E. Pringle,et al.  X-ray emission from dwarf novae. , 1979 .

[7]  J. Pringle.  Soft X-ray emission from Dwarf Novae , 1977 .

[8]  J. Patterson,et al.  X-ray emission from cataclysmic variables with accretion disks. I - Hard X-rays. II - EUV/soft X-ray radiation , 1985 .

[9]  M. Irwin,et al.  A digital technique for the separation of the eclipses of a white dwarf and an accretion disc , 1985 .

[10]  E. L. Robinson,et al.  Hubble Space Telescope observations of the dwarf Nova Z Chamaeleontis through two eruption cycles , 1995 .

[11]  T. Marsh,et al.  X-ray observations of the eclipsing nova-like variable UX UMa , 1995 .

[12]  Tim Naylor,et al.  The discovery of an X-ray eclipse during a low state of the dwarf nova HT Cassiopeiae , 1995 .

[13]  B. Warner.  The Cataclysmic Variable Stars , 1996 .

[14]  C. Leitherer,et al.  Nonisotropic and variable outflows from stars , 1992 .