A Microdensitometer for Astronomy and Other Research at the University of Virginia

弗吉尼亚大学天文系打算 买一台珀金埃尔默PDS显微光密度计和附件。 的 PDS将主要与大型（超过 146，000）收集的天体测量板的文件， 利安德·麦考密克天文台 带激光的测量引擎 干涉测量坐标读出将提高精度， 现有的天文测量计划的生产力。天体测量 从PDS中受益最大的项目包括：1）研究 毕宿星团成员的恒星，白色矮星和 星族II主序星; 2）天体测量分析 二进制。 PDS系统将有助于进行中的研究 该部门的研究包括：1）表面光度学， 旋涡星系的暗淡外围区域; 2） 星系团的光度函数; 3）探测和 1989年发射线星系氢α的测量 4）分析地面光学数据， 在紫外线中发现的有趣的紫外线（UV）源 成像望远镜计划。

The Astronomy Department of the University of Virginia intends to acquire a Perkin.Elmer PDS microdensitometer and accessories. The PDS will be used primarily in conjunction with the large (over 146,000) collection of astrometric plates in the files of the Leander McCormick Observatory. The measuring engine with a laser interferometry coordinate readout will improve accuracy and productivity in the existing astrometric programs. The astrometric projects which will benefit most from the PDS include: 1) studies of parallaxes of Hyades cluster members, white dwarfs and the population II main sequence stars; and 2) analysis of astrometric binaries. Studies where the PDS system will contribute to ongoing research in the department include: 1) surface photometry in faint outlying regions of spiral galaxies; 2) determinations of the luminosity function for clusters of galaxies; 3) detection and measurement of Hydrogen alpha from emission line galaxies in clusters; and 4) analysis of ground-based optical data of interesting ultraviolet (UV) sources found in the Ultraviolet Imaging Telescope program.