CCD图像相对测光中的技术研究与精度回报现象  

Technology Research and Precision Premium in Relative Photometry Based on CCD Images

作　　者：郭碧峰 彭青玉[1,2] 尚一佳 覃永贵 林孚荣 Guo Bifeng;Peng Qingyu;Shang Yijia;Qin Yonggui;Lin Furong(Department of Computer Science, Jinan University, Guangzhou 510632, China;Sino-French Joint Laboratory for Astrometry, Dynamics and Space Science, Jinan University, Guangzhou 510632, China)

机构地区：[1]暨南大学计算机科学系,广东广州510632 [2]暨南大学中法天体测量、动力学与空间科学联合实验室,广东广州510632

出　　处：《天文研究与技术》2022年第2期111-117,共7页Astronomical Research & Technology

基　　金：国家自然科学基金(11873026,11273014,U1431227);暨南大学优秀本科推免生科研创新培育计划项目.

摘　　要：天体随时间的光度变化能够反映其物理性质,高精度测光技术有助于我们更好地分析与探究天体的光变情况,对天体的演化研究有重要意义。介绍了相关的测光工具与技术,探索了把MaxIm DL与photutils测光库相结合的测光技术及应用,提出了连续图像中各星像测光数据快速匹配的解决方案。通过分析中国科学院云南天文台1 m光学望远镜拍摄的M35星团图像发现,相对测光中存在精度回报现象,即相近的两颗星进行相对测光具有更高的测量精度,且该现象的显著程度与大气质量相关。针对相对测光的精度回报现象,提出了高精度相对测光的参考方法。The changes of celestial bodies′light with time can reflect their physical properties,and precise photometry technology helps us analyze and explore the changes of light better,which is of great significance to the study of the evolution of celestial bodies.This paper introduces the related photometry tools and technologies and suggests a method of photometry technology and its application by combining MaxIm DL with photutils.Besides,this paper puts forward a fast-matching solution of each star image′s photometric data in continuous frames.By analyzing the images of M35 cluster taken by the 1 m optical telescope of Yunnan Observatories,Chinese Academy of Sciences,we find there is a phenomenon of precision premium in relative photometry.Namely,two close stars have better measurement precision in relative photometry,and the significance of this phenomenon is related to the atmosphere mass.According to the phenomenon,this paper proposes some reference methods in high precision relative photometry.

关 键 词：相对测光 测光精度回报 CCD图像处理 photutils MaxIm DL 

分 类 号：P141.2[天文地球—天体物理]