新疆天文台南山1m宽视场光学望远镜测光系统  

Photometry System of the Nanshan One-meter Wide Telescope at Xinjiang Astronomical Observatory

作　　者：单星美 钟靖[2] 张余 牛虎彪 刘进忠[3] 陈力[2] 李静[1] SHAN Xing-mei;ZHONG Jing;ZHANG Yu;NIU Hu-biao;LIU Jin-zhong;CHEN Li;LI Jing(China West Normal University,Nanchong 637000,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China)

机构地区：[1]西华师范大学,南充637000 [2]中国科学院上海天文台,上海200030 [3]中国科学院新疆天文台,乌鲁木齐830011

出　　处：《天文学进展》2021年第1期118-127,共10页Progress In Astronomy

基　　金：国家自然科学基金(11703019);中国科学院上海天文台CSST-MCI团队项目;2017年新疆维吾尔自治区引进高层次天池百人计划;西华师范大学博士启动基金16E018。

摘　　要：测光系统的流量定标是一项重要和基础的工作,其中影响流量定标的主要因素有探测器响应(测光零点)、颜色改正项和大气质量等。利用新疆天文台南山1 m宽视场光学望远镜对Landolt标准天区J054610+45的测光标准星进行了大气质量不同条件下的U,B,V,R,I多波段观测,根据布格定律求得了大气消光系数;并利用2017年11月29日―2019年1月4日期间的标准天区观测数据求得了各波段的测光零点和颜色改正项,实现了从NOWT仪器星等到Landolt标准星等的转换,为今后使用该望远镜的用户开展流量定标工作提供了方法上的参考。结果显示,不同天的流量定标转换系数会有一定程度的变化,为了取得较好的流量定标结果,需要每天对标准星进行观测并求得当天的流量定标转换系数;另一方面,考虑到实际的观测条件有限,大气消光系数可以认为在一段时期内保持稳定,使用一段时期内平均大气消光系数进行的流量定标仍然能够得到较好的定标结果。The flux calibration of photometry system is an essential and basic work.The main factors which influence the calibrations include the detector response function(photometric zero point),colors of the stars and airmass.The Xinjiang Astronomical Observatory’s nanshan one-meter wide-field telescope was used to conduct multi-band observations of the U/B/V/R/I standard star in the Landolt standard field J054610+45 under different airmass,and the atmospheric extinction coefficient was obtained according to the Bouguer’s law.We used the observation data of the standard field from November 29th,2017 to January 4th,2019 to obtain photometric zero point as well as color correction items of each band and to make the conversion from the NOWT instrument magnitude to the Landolt standard magnitude,which provides a methodological reference for users to conduct flux calibrations with the telescope in the future.The results show that the flux calibration correction coefficients of different days will fluctuate to a certain extent.In order to obtain better flow calibration results,it is necessary to observe the standard stars every day in order to obtain the flux calibration correction coefficients of the day;On the one hand,considering the limitations of practical observation conditions,the atmospheric extinction coefficient could be considered to be constant for a period of time,and the flux calibration using the average atmospheric extinction coefficient over a period of time can still lead to good calibration results.

关 键 词：光学望远镜 标准星 测光 

分 类 号：P111.2[天文地球—天文学]