视频CCD观测的星径曲率改正

The Curvature Corrections for the Observations From a Video CCD

视频ＣＣＤ观测与低纬子午环原来设计的光子计数狭缝测微器观测有不同之处。在观测数据的归算过程中，应加以考虑的星径曲率改正包括三种改正量；卯酉方向记录时刻的星径曲率改正；卯酉方向天顶距的星径曲率改正以及子午方向天顶距的星径曲率改正。

Since the observation of the LLMC with a video CCD is different from that with an attached photo couting micrometer, some curvature corrections for the observations need to be derived again. In this paper, three types of curvature corrections are included during the data reduction. They are the curvature corrections for recording time at the determined zenith distances when a star passes the prime vertical and the meridian circle.