KMS of Xinjiang Astronomical Observatory, CAS
| 疏散星团NGC 1582方向变星巡天研究 | |
| Alternative Title | A study of variable stars in the open cluster NGC 1582 and its surrounding field |
宋芳芳
| |
| Subtype | 硕士 |
| Thesis Advisor | 艾力·伊沙木丁 |
| 2016 | |
| Degree Grantor | 中国科学院大学 |
| Place of Conferral | 北京 |
| Degree Discipline | 天体物理 |
| Keyword | 变星 疏散星团 Ngc 1582 光变曲线 多色测光 |
| Abstract | 恒星的光变提供了恒星结构及运动方面的重要物理信息，而对疏散星团的研究在理解恒星形成及演化和了解银河系结构方面有重要作用。NGC 1582 作为银河系中疏散星团的一员，历年来对它的观测研究比较少。我们用新疆天文台南山1米大视场望远镜对它进行14天的BVR三色时序观测，共获得了1792 帧观测数据，为发现和研究NGC 1582 方向上的时变天体积累了有效的数据，并为下一步使用该望远镜开展时域巡天工作奠定了基础。本文首先介绍了疏散星团NGC 1582 的基本特征、使用的观测设备、观测设置和数据处理方法，同时讨论了星等校标方法以及本文所使用的大视场时变天体搜寻方法。本研究使用了美国海军天文台星表对视场内的星进行拟合校标。利用XAO 时域巡天数据处理和搜寻系统在NGC 1582 方向发现了19颗不同类型的变星和3颗变星候选体，其中12颗变星是本研究工作中新发现的。通过对变星类型的判定及其性质分析，得到了以下结论：1.基于观测得到的三色光变曲线，对变星的类型进行了划分。在这19颗变星中，有5颗食双星系统，6颗脉动变星（包括一颗RR天琴座变星和一个确定的δ 盾牌座变星）。本工作估算了RR天琴座变星的距离约为8kpc，表明这是一颗位于星团后方的场星。剩余8颗变星不能完全确定其类型。本工作通过折叠相位搜索食双星的周期，给出了食双星系统的相位图；对脉动变星进行频谱分析，初步得出了它们的脉动周期，给出了脉动变星的光变相位图。为进一步揭示这些变星的性质，需要更多的光度观测数据和光谱观测数据。2.使用颜色―星等图，并结合视场内变星的空间分布，初步判定13颗星体（包括一颗RR天琴座变星和3颗变星候选体）是非成员星，4颗变星是可能的星团成员，其余5颗变星尚无法判断其成员身份。 |
| Other Abstract | Light variations provide important physical information for stellar structure andstellar motion, while open clusters play an important role in understand the formationand the evolution of stars, and realize the structure of the Milky way. As a member ofopen clusters in our galaxy, NGC 1582 has been rarely studied by scientists over theyears. Using Nanshan 1m telescope of Xinjiang Astronomical Observatory(XAO), wepresented the 14 days’time-series photometric observations of B, V, and R bands and accumulated 1792frames of observational data. It provides much sufficient data to research the variablesin the direction of NGC 1582, and lays the foundation for the next survey work ofNanshan 1m telescope.This thesis outlined the basic characteristics of the open cluster NGC 1582, theobservational instruments, the method of observation and image processing. What’smore, it’s also discussed the method to calibrate clusters and search variables. Usingthe American Naval Observatory catalog to linear fitting and calibrating the stars inthe field of view.We found 19 variable stars with different types and 3 variable candidates in thedirection of NGC 1582 with XAO time-domain sky survey data processing system,while 12 variables are newly discovered. Through judging the membership of variablesand analyzing the properties of these stars, there are some conclusions obtainedas follow:1.Based on the tri-color light curves of the variable stars obtained by observations,the types of variables can be preliminarily divided. Among the 19 variable stars, 5of them are eclipsing binary systems, and 6 of them are pulsating variables includinga RR Lyrae star and the one which is a certain δ Scuti star in the VSX database. TheRR Lyrae star is estimated to be about 8kpc away from the sun, which indicates that itis a field star behind the cluster. For the remaining 8 stars, they are unconfirmed typeof variables. Through folding the light curves of the 5 eclipsing binary systems, weobtained the phased images of the eclipsing binary systems, and also obtained the pulsatingperiods and phased images of pulsating stars through analyzing their frequency spectrum. To further reveal the nature of the variables, more data of photometric andspectroscopic observations are required.2.Using color-magnitude diagram, combined with the distribution of the stars inthe view field, we can preliminarily predicated that 13 objects(including the RR Lyrae star and the 3 candidates) were non-members of the cluster, and 4 variables werepossible members of the cluster. The membership of the remaining 5 variables can notbe determined in this work. |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/1722 |
| Collection | 研究生学位论文 光学天文与技术应用研究室 |
| Affiliation | 中国科学院新疆天文台 |
| Recommended Citation GB/T 7714 | 宋芳芳. 疏散星团NGC 1582方向变星巡天研究[D]. 北京. 中国科学院大学,2016. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 宋芳芳-学位论文.pdf（10598KB） | 学位论文 | 暂不开放 | CC BY-NC-SA | Application Full Text | ||
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