高精度绝对自行的归算方法研究

The research on the calibration of absolute proper motions

介绍了利用数字化施密特巡天底片数据求解银盘外恒星绝对自行的基本原理和方法,描述了如何检测并消除自行中各种系统差的工作.基于本文的方法,利用COMPASS底片数据库中的部分底片数据进行了实验,对于暗至RF=20.5星等的天体,归算得到的绝对自行的零点精度达到了±0.2mas/yr的水平,整体精度好于±5.5mas/yr,基本消除了自行中与星等和颜色相关的系统差.本工作显示了进一步改进现有施密特巡天星表自行的可行性,为如何消除GAIA星表自行的颜色和星等差提供了一种解决思路.本文还给出了一种利用星系与恒星间整体运动特性差异来挑选星系的新手段.

The research on the calibration and removal of systematic errors for absolute proper motions using digitized sky survey Scbmidt plate data is presented. A test was undertaken based on some Schmidt plate data resulting in a zero point precision of 0.2 mas/yr, and the overall accuracy is better than 5.5 mas/yr. The systematic errors related to the position, magnitude and color are practically all removed by using extragalactic objects. This work shows the possibility for improving the proper motions of the catalogs based on Schmidt plate data. This effort also give art idea for GAIA to dispel the magnitude- and color-dependent systematic errors in its proper motions and link them onto an inertial system vi the extragalactic sources like galaxies and quasars. A new method for classifying out the galaxies from the stellar objects by using the differences of their kinematics characters is also presented.