Searching for Unidentified Bright Cataclysmic Variables

Details Searching for Unidentified Bright Cataclysmic Variables Searching for Unidentified Bright Cataclysmic Variables

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6503s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #65.03; Bulletin of the American Astronomical Society, Vol. 39, p.855

Astronomy and Astrophysics

Astronomy

Scientific paper

There have been many photometric and spectroscopic studies of "bright stars” (such as the HD catalog), and now there are significant studies of "faint stars” (such as the SDSS). Between these regimes, there remains an "uncharted territory” spanning a visual magnitude range of roughly 10-12. This gap is clearly observed in the distribution of known cataclysmic variables (CVs): the brightest steady-state CVs are V≈9, with the number per unit magnitude interval increasing until V≈19, but there is a noticeable minimum in the number of known CVs around V≈11. This dearth can be interpreted as a lack of comprehensive studies at V=10-12, rather than a true lack of objects. Are there more bright CVs waiting to be found? We recently made a serendipitous discovery of a bright CV at V≈11.5, which is now the fourth brightest UX UMa-type CV known. With the properties of this object as a guide, we can use existing photometric and objective prism surveys of 10-12th magnitude stars to identify further candidate CVs. These candidates can be followed up for classification with observations from relatively small telescopes. In this talk we will discuss our methods for identifying CV candidates and observational follow-up.

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