Exploration of the Time Domain With DPOSS: A Search for Highly Variable Objects in Plate Overlaps

Details Exploration of the Time Domain With DPOSS: A Search for Highly Variable Objects in Plate Overlaps Exploration of the Time Domain With DPOSS: A Search for Highly Variable Objects in Plate Overlaps

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19910101m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #101.01; Bulletin of the American Astronomical Society, Vol. 33, p.1461

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Exploration of the time variability on the sky at all flux levels and all wavelengths is rapidly becoming a new frontier of astronomical research. We report on the results of a preliminary study, based on the regions of the sky multiply imaged in DPOSS plate overlaps. Approximately 40% of the northern sky was imaged at least twice in each of the 3 DPOSS bands, with time baselines extending to a couple of years. Reaching down to ~ 21 mag, this is a unique data set with which to explore the variability of the sky at visible wavelengths. In this pilot project, we covered over 2000 deg2 in all 3 DPOSS bands (roughly Gunn gri). We used an automated procedure to find highly variable objects from the overlap regions of DPOSS plate catalogs. A number of candidates were identified, and some were followed up spectroscopically at Palomar. They include a diverse group of AGN, cataclysmic variables, and possibly other types of objects. A number of other interesting objects have been found serendipitously over the years in the course of DPOSS work including a candidate for a GRB ``orphan afterglow'', normal stars undergoing so-called mega-flares, etc. This work illustrates the great potential for studies of the variability on the sky using systematic, digital sky surveys. Cataloging of DPOSS was supported in part by a generous gift from the Norris Foundation. Software development work was supported in part by grants from NASA. BG acknowledges a SURF fellowship.

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