Cataclysmic Variables from the Faint Sky Variability Survey

Details Cataclysmic Variables from the Faint Sky Variability Survey Cataclysmic Variables from the Faint Sky Variability Survey

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915707h&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #157.07; Bulletin of the American Astronomical Society, Vol. 34, p.566

Astronomy and Astrophysics

Astronomy

Scientific paper

The Faint Sky Variability Survey is a large, deep field, optical, photometric survey using the Wide-Field Camera at the Isaac Newton Telescope on La Palma. Approximately 18 square degrees have been observed photometrically in BVI colors with variability sampling of 10's of minutes to years. Current population synthesis models for cataclysmic variables (CVs) predict the majority (70%) have passed the orbital period minimum of 80 min. Such systems are intrinsically faint with very low mass transfer rates and a brown dwarf-like secondary object as the mass donor. An observational bias from apparent magnitude limits in the past has revealed a dominant population of intrinsically brighter CVs and very few of the low-luminosity type past the 80 min period minimum. The large area coverage and faintness limits of the FSVS provide a significant volume sample in order to locate the intrinsically faint population of cataclysmic variables predicted to be the dominant population by interacting binary evolutionary theory. Cataclysmic variables candidates are selected by color (B-V, V-I) and intrinsic variability (orbital modulations and flickering), a unique parameter for a large survey to very deep limits in V of 23 mags. We will present and discuss the current results in the search for elusive low-luminosity cataclysmic variables including the selection process, follow-up observations, and estimated space densities. MEH acknowledges support from by a NASA/Space Grant Fellowship, NASA Grant #NGT-40008.

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