Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1208t&link_type=abstract
American Astronomical Society, AAS Meeting #212, #12.08; Bulletin of the American Astronomical Society, Vol. 40, p.530
Astronomy and Astrophysics
Astronomy
Scientific paper
The Digital Access to a Sky Century at Harvard (DASCH) Collaboration has developed an ultra-high speed digital plate scanner which will ultimately enable the digitizing of the 500,000 Harvard plates from the 1880s to the 1980s with limiting magnitudes ranging from B=14-19. Every point on the sky has been observed typically 300-1000 times with typical error 0.15 mag (limited now only by the GSC2.3 photometry calibration). This 100 year coverage is a unique resource for studying temporal variations in the universe. For several science demonstration projects, we have scanned more than 2500 plates in several different fields. Here we present the preliminary results on one field: a 20deg x 20deg scanned region centered on the open cluster M44. We report initial results for long-term variability of Cataclysmic Variables (CVs), eclipsing binaries, coronal flare stars, as well as blind searches for possible supernovae and tidal disruption events at the positions of 40,000 SDSS galaxies contained within this field with spectral redshifts.
Grindlay Jonathan
Laycock Silas
Los Edward
Tang Sumin
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