Search for Dwarf Novae in DASCH Scans Near M44

Details Search for Dwarf Novae in DASCH Scans Near M44 Search for Dwarf Novae in DASCH Scans Near M44

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..259t&link_type=abstract

ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum

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Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Accretion And Accretion Disks, Binary And Multiple Stars

Scientific paper

Dwarf novae (DNe) are a subclass of Cataclysmic Variables (CVs) with outbursts powered by a disk instability leading to a sudden increase in the accretion rate. The Digital Access to a Sky Century at Harvard (DASCH) Collaboration is preparing to digitize over 500,000 Harvard plates from the 1880s to the 1980s with limiting magnitudes ranging from B~14-19. As a demonstration project, we have scanned more than 500 plates in the fields centered on the galactic open cluster M44. There are 21 CVs in the fields within 10 degrees of M44 covered by the scans. Here we present the preliminary results of DN outbursts of the known CVs to derive long-term DN outburst duty cycles. In addition, a 100y lightcurve for a XMM-Newton source is also presented to demonstrate DASCH capabilities.

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