Galactic Structure and Kinematics from Absolute Proper Motions

经过半个世纪的工作，北方自行(NPM)计划即将完成。第一纪元摄影始于1947年，第二纪元摄影于1988年完成。对银河系外天空中的自行、位置和光度的测量和减少(NPM计划的第一部分)于1975年开始，并于1992年完成。Lick NPM1目录包含149,000颗星，于1993年提交给用户社区。NPM计划第二部分的工作始于1996年，在银河系天空中有大约30万颗恒星，1999年完成了板块测量。这项奖励将支持NPM2最后三年的数据缩减和星级识别。NPM计划将随着2003年Lick NPM2星表的出版而完成。NPM1和NPM2星表将作为一个独特的数据库对未来许多星系结构、恒星运动学和天体测量的研究具有持久的价值。该奖项是通过天文科学部的银河天文计划颁发的。***

AST 9988105JonesThe Northern Proper Motion (NPM) program is nearing completion after a half century of work. First-epoch photography began in 1947; second-epoch photography was completed in 1988. Measurements and reductions for proper motions, positions, and photometry in the sky outside the Milky Way (Part I of the NPM program) began in 1975 and were completed in 1992. The Lick NPM1 Catalog, containing 149,000 stars, was presented to the user community in 1993. Work on Part II of the NPM program, with some 300,000 stars in the Milky Way sky, began in 1996, and plate measurements were completed in 1999. This award will support data reduction and star identifications for the final three years of NPM2. The NPM program will be completed with the publication of the Lick NPM2 Catalog in 2003.The NPM1 and NPM2 catalogs will have lasting value as a unique database for many future studies in galactic structure, stellar kinematics, and astrometry. This award is made through the Galactic Astronomy Program in the Division of Astronomical Sciences. ***