UGPS J194310+183851: an Unusual Optical and X-ray Faint Cataclysmic Variable?

C. Morris, T. J. Maccarone, P. W. Lucas, J. Strader, C. T. Britt, N. Miller, S. J. Swihart, W. J. Cooper, J. E. Drew, Z. Guo

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The growing number of multi-epoch optical and infrared sky surveys are uncovering unprecedented numbers of new variable stars, of an increasing number of types. The short interval between observations in adjacent near-infrared filters in the UKIDSS Galactic Plane Survey (UGPS) allows for the discovery of variability on the time-scale of minutes. We report on the nature of one such object, through the use of optical spectroscopy, time series photometry, and targeted X-ray observations. We propose that UGPS J194310.32+183851.8 is a magnetic cataclysmic variable star of novel character, probably featuring a longer than average spin period and an orbital period likely to be shorter than the period gap (i.e. Porb < 2 h). We reason that the star is likely a member of the short-period intermediate-polar subclass that exists below this period boundary, but with the additional feature that system's spectral energy distribution is fainter and redder than other members of the group.

Original languageEnglish
Pages (from-to)6002-6010
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date21 Jun 2022
Publication statusPublished - 1 Aug 2022


  • novae, cataclysmic variables
  • stars: individual: UGPS J194310.32+183851.8
  • stars: peculiar
  • stars: variables: general


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