基于CCD图像的疏散星团M35、NGC1664的自行求解

发布时间：2018-04-10 13:38

本文选题：天体测量 + 相对自行　；参考：《暨南大学》2016年硕士论文

【摘要】：近年来,利用自行研究星团成员和内部运动、寻找外星行星、测量银河系中心黑洞的质量等已成为银河系和宇宙运动学有关的热点课题。在自行与星团的研究中,疏散星团M35和NGC1664都是具有重要研究价值的星团。它们的金属丰度、成员概率等性质为验证恒星的演化理论提供了很好的实验数据。本文利用Zacharias等人的UCAC4星表作为初始星表,对最近几年在云南昆明1m望远镜和丽江2.4m望远镜拍摄的疏散星团M35和NGC1664资料进行处理,对这些历元间隔5年和6年的资料进行搜星、匹配后用高阶常数模型和几何扭曲模型两种方法对数据进行归算并求解这两个星团的相对自行。通过对位置残差和相对自行结果的分析,发现几何扭曲模型是不稳定的,用高阶常数模型拟合求解得到的结果精度优于几何扭曲模型得到的结果精度。最后本文给出了用高阶常数模型拟合方法求解得到的疏散星团M35、NGC1664的总计570颗星的相对自行。其中,NGC1664星团的相对自行精度的中值分别为赤经方向2.5 mas/yr、赤纬方向2.4 mas/yr。M35星团的相对自行精度的中值分别为赤经方向1.6 mas/yr、赤纬方向1.9 mas/yr。通过和Bouy等人2015年对M35星团的自行研究资料进行比较,显示出本文对M35星团的自行求解结果略微差于Bouy等人的研究成果,但是优于UCAC4星表上的自行。
[Abstract]:In recent years, it has become a hot topic in the kinematics of the Milky way and the Universe to study the members and internal motions of the star clusters, to find the alien planets, and to measure the mass of the central black holes in the Milky way.In the study of self and cluster, both open cluster M35 and NGC1664 are of great value.The properties of their metal abundance and membership probability provide good experimental data for the verification of stellar evolution theory.In this paper, Zacharias et al.'s UCAC4 catalogue is used as the initial catalogue to process the M35 and NGC1664 data taken by Kunming 1m telescope and Lijiang 2.4m telescope in recent years.After matching, the data are reduced by two methods: high order constant model and geometric distortion model, and the relative propriety of these two clusters is solved.Through the analysis of the position residuals and the relative natural results, it is found that the geometric distortion model is unstable, and the precision of the result obtained by fitting the higher order constant model is better than that obtained by the geometric distortion model.Finally, the relative propriety of 570 stars of open cluster M35 NGC1664 obtained by using the high order constant model fitting method is given.The mean values of the relative autonomous accuracy of NGC 1664 cluster are 2.5masyr in the longitude direction, 1.6 mas-yr in the longitude direction and 1.9 mas-yrin in the red latitude direction, respectively.By comparing with the self-study data of M35 cluster by Bouy et al in 2015, it is shown that the self-solving result of M35 cluster in this paper is slightly worse than that of Bouy et al., but it is better than that of UCAC4 catalogue.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P154.11;TP391.41

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