中国空间站望远镜(CSST)密集星场天体自行研究  

Stellar Proper Motion Study of Crowded Stellar Field of CSST

作　　者：聂嘉潞 曹子皇 刘超 田海俊[4] 田浩 张鑫 韦成亮 李晓波 班章[6,7] 赵永恒 NIE Jia-lu;CAO Zi-huang;LIU Chao;TIAN Hai-jun;TIAN Hao;ZHANG Xin;WEI Chen-liang;LI Xiao-bo;BAN Zhang;ZHAO Yong-heng(Key Laboratory for Optical Astronomy,National Astronomical Observatory,Chinese Academy of Sciences,Beijing 100012,China;University of Chinese Academy of Sciences,Beijing 100049,China;Joint Science Center for China Space Station Telescope,National Astronomical Observatory,Chinese Academy of Sciences,Beijing 100012,China;Hangzhou Dianzi University,Hangzhou 310018,China;Key Laboratory of Galaxy Cosmology and Astronomical Big Data Techniques,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210033,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;CAS key Laboratory of On-orbit Manufacturing and Integration for Space Optics System,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院国家天文台光学天文重点实验室,北京100012 [2]中国科学院大学,北京100049 [3]中国科学院国家天文台空间站望远镜科学应用研究中心,北京100012 [4]杭州电子科技大学,杭州310018 [5]中国科学院紫金山天文台星系宇宙学和暗能量研究重点实验室,南京210033 [6]中国科学院长春光学精密机械与物理研究所,长春130033 [7]中国科学院长春光学精密机械与物理研究所空间光学系统在轨制造与集成重点实验室,长春130033

出　　处：《天文学进展》2023年第2期240-256,共17页Progress In Astronomy

基　　金：中国载人航天工程巡天空间望远镜专项科学研究(CMS-CSST-2021-A08);LAMOST人工智能远程观测辅助系统研究(12073047);湖北省杰出青年基金(2019CFA087)。

摘　　要：对密集星场自行研究是天体测量领域的难题之一,深刻地影响着相关领域的发展。空间观测对于研究密集星场的优势十分明显。CSST可以提供高精度绝对自行,弥补HST在观测覆盖范围以及Gaia在暗弱星等方面的不足。银河系核球区作为典型的密集星场天区,具备很强科学价值,但数据处理方面面临很大挑战。以银河系核球区为例,验证了绝对自行处理方法,并对CSST密集星场的观测策略提出建议。基于CSST核球区仿真观测图像,开展数据处理方法的研究和验证。使用两种定心方法并进行比较,定心精度可达近0.03~0.08 pixel。以10 a为基线长度,对比了不同观测方法下所得到绝对自行的精度,发现等间隔观测的策略最优。基于此方法,得出结论:对于18~24 mag的恒星,通过6次观测,可以得到好于0.2 mas/a的绝对自行精度。最后,估计了不同时间基线和恒星速度下视差对自行的影响。The stellar absolute proper motion of crowded field is an important problem of astrometry.The space-based observation could get high spatially revolved images in the crowded field.The China Space Station Telescope(CSST)can provide high precision absolute proper motion that significantly improve the performance of HST and Gaia in the sky area and deepness of observation.The Galactic bulge,as it is of importance in galactic science and is difficult to process,was selected as a sample of the high-density area to test our method and CSST observation performances.We simulated the CSST observed image and implement our test on it.Two centering methods are conducted,and the precision of centering is about 0.03 to 0.08 pixels depending on the magnitude.The absolute proper motion was measured under different observation strategies in the 10 a baseline.After comparison,we find that equal interval observation is the best choice.We then conclude that six observations can obtain the precision of proper motion is better than 0.2 mas/a between 18~24 mag.Finally,we estimate the effect of parallax in the proper motion estimation under the different time baselines and stellar velocities.

关 键 词：密集星场 空间天文观测 银河系 自行 

分 类 号：P126[天文地球—天体测量] P144.6[天文地球—天文学]