Data Mining for Dwarf Novae in SDSS, GALEX and Astrometric Catalogues
Submitted on 19 Oct 2009. Accepted for publication in Monthly Notices of the Royal Astronomical Society
Patrick Wils, Boris T. Gaensicke, Andrew J. Drake, John Southworth
Abstract: By cross matching blue objects from SDSS with GALEX and the astrometric catalogues USNO-B1.0, GSC2.3 and CMC14, 64 new dwarf nova candidates with one or more observed outbursts have been identified. 14 of these systems are confirmed as cataclysmic variables through existing and follow-up spectroscopy. A study of the amplitude distribution and an estimate of the outburst frequency of these new dwarf novae and those discovered by the Catalina Real-time Transient Survey (CRTS) indicates that besides systems that are faint because they are farther away, there also exists a population of intrinsically faint dwarf novae with rare outbursts.