数字访问哈佛的天空世纪。II：初始测光和天体测量
Digital Access to a Sky Century at Harvard. II: Initial Photometry and Astrometry
摘要：
Digital Access to a Sky Century @ Harvard（DASCH）是一个项目，旨在收集哈佛大学天文台收藏的约50万张玻璃摄影底片。收集的时间跨度从1880年到1985年，在此期间，天空中的每个点都被观察了大约500到1000次。在本文中，我们描述了DASCH调试运行的结果，在此期间，我们开发了数据简化管道和微调的数字化器的性能和操作。这一初始运行由500个来自各种不同板系列的板组成，所有板都包含疏散星团Praeseppe（M44）。我们报告说，在0.1等的水平上，精确的测光是可能的，在大多数的板，并展示了百年之久的各种类型的变星在M44和周围的光变曲线。
英文摘要：
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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