Discovery of an EUV-bright polar in the period gap from the ROSAT Wide Field Camera sky survey

Details Discovery of an EUV-bright polar in the period gap from the ROSAT Wide Field Camera sky survey Discovery of an EUV-bright polar in the period gap from the ROSAT Wide Field Camera sky survey

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262...93b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 93-108.

Astronomy and Astrophysics

Astronomy

36

Cataclysmic Variables, Extreme Ultraviolet Radiation, Light Curve, Sky Surveys (Astronomy), Stellar Magnetic Fields, Stellar Mass Accretion, Accretion Disks, Emission Spectra, Rosat Mission, Stellar Radiation, X Ray Stars

Scientific paper

The discovery of a new polar found during the all-sky survey of extreme-UV sources conducted by the UK Wide Field Camera on board ROSAT is reported. The V of about 16 object is the brightest EUV polar observed by this instrument during the survey. These and subsequent optical observations show that the orbital period of the system is 2.33 h, placing it well inside the cataclysmic variable 'period gap'. Results from preliminary optical photometry, spectroscopy, and polarimetry are presented and compared to other known polars. The ROSAT results indicate that the system exhibits a soft X-ray excess by at least a factor of about 2 over the hard bremsstrahlung component. The likely evolutionary status of this 'period gap' polar is discussed, and it is concluded that it was probably born in the gap rather than evolving through it from a longer period. The probable accretion geometry of the system is also discussed.

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