Digital Access to a Sky Century at Harvard. II: Initial Photometry and Astrometry

Details Digital Access to a Sky Century at Harvard. II: Initial Photometry and Astrometry Digital Access to a Sky Century at Harvard. II: Initial Photometry and Astrometry

2008-11-13

arxiv.org/abs/0811.2005v1

Astronomy and Astrophysics

Astrophysics

Submitted to AJ. 21 pages, 20 figures. See the DASCH project webpage: http://hea-www.harvard.edu/DASCH for high resolution fig

Scientific paper

Digital Access to a Sky Century @ Harvard (DASCH) is a project to digitize the collection of ~500,000 glass photographic plates held at Harvard College Observatory. The collection spans the time period from 1880 to 1985, during which time every point on the sky has been observed approximately 500 to 1000 times. In this paper we describe the results of the DASCH commissioning run, during which we developed the data-reduction pipeline and fine-tuned the digitzer's performance and operation. This initial run consisted of 500 plates taken from a variety of different plate-series, all containing the open cluster Praeseppe (M44). We report that accurate photometry at the 0.1mag level is possible on the majority of plates, and demonstrate century-long light-curves of various types of variable stars in and around M44.

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