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Algol型双星的观测研究
Alternative TitleAn Observational Study of Algol-Type Binary System
张嘉
Subtype博士
Thesis Advisor钱声帮
2013-11-29
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天体物理
KeywordAlgol 半接双星 测光观测 光谱观测 物质转移 光变分析
AbstractAlgol型双星是双星的一种,其独特的半接结构使它拥有丰富的物理现象,包括严重畸变的充满子星、强磁活动现象,物质转移的各种形式,完全迥异于单星的演化状态和特有的形成历史。本文对双星光变曲线的基础物理做了介绍,同时介绍了历史上的各个模型或程序。展示了各个物理参数对光变曲线的影响,包括倾角、温度、金属丰度、表面重力加速度、第三光、半径、轨道椭率和轨道近点角。根据已有星表统计了Algol型双星的性质,并对三颗样本星进行了具体的观测和分析,结果如下: 1、对Algol型双星进行了统计分析,结果支持前人的分离子星大多为主序星的结论。质量比的分布支持我们对于Algol型双星质量比临界值的理论计算,同时猜测Algol型双星的半径比可能存在下限。发现Algol型双星中两子星的温度、光度、半径和质量都具有较好的相关性。 2、观测并分析了双星FG Gem。基于不同温度光度组合的大量的解轨参数,使用新的对比年龄的方法得出双星FG Gem是半接双星的结论。使用新的温度搜寻的方法改善了对分离子星温度的估计值。对FG Gem特殊的周期变化,提出了原因可能是间断性物质流和持续的磁滞的共同作用。 3、以双星VV Vir为例,讨论了Algol型双星中物质流的一些性质。某些性质可以反映半接系统中物质流的一些共性,包括:流的半径很小,进而造成的撞击斑的半径也很小。在物质转移率较高的情况下,物质流的能量转移率可以比拟分离子星的本征光度。撞击斑的位置由周期、质量比和分离子星的无量纲势决定。撞击斑的温度很高,并能够以驼峰的形式直接反映在光变曲线上。 4、发现了一颗罕见的正处在质量比反转过程中的Algol型双星V753 Mon,这颗双星的质量比非常接近1,处在双星演化的重要阶段,为双星演化理论提供了观测上的重要样本。
Other AbstractAlgol-Type binary system is a subtype of binary system, the unique semi-detached structure make it have abundant physical phenomena ,including dramatic distorted semi-detached component star, strong magnetic activities, kinds of mass transfer form, the completely different evolutional track from single stars and its exclusive history of formation. In this paper, the fundamental physics of light curves are introduced, and various of models or programs in history are also introduced. The influence of different parameters on light curves are shown, including inclination, temperature, abundance, surface gravity, the third light, radius, orbital eccentricity, argument of periastron. Based on the current catalog, the statistic characteristics of Algol-Type binaries are studied. Three individual Algol samples are observed and analysed in detail. The results are as follows: 1. The Algol-Type binary stars are studied statistically, the results support the previous conclusion that most of the detached component stars are main sequence stars. The distribution of the mass ratio agrees on our theoretical calculation of the critical value of mass ratio in Algol-Type stars. A lower limit of radius ratio is suggested. The temperature, luminosity, radius and mass of the component stars in Algol-Type binaries are found with good correlations. 2. The binary system FG Gem is observed and analysed. Based on the solutions of large different combinations of temperature and luminosity, a new method of comparing age is used to get the conclusion that FG Gem is a semi-detached system. A new method of temperature searching is used to get a better estimated temperature of the detached component star. For the special orbital period changes, a reason of the combination of the intermittent mass flow and the continuous magnetic braking is suggested. 3. Taking VV Vir as an example, some properties of the mass flow in a semi-detached binary are discussed. Some of the properties can reflect the common characters of the mass flow in the Algol systems, including that: The radius of the mass flow is very small, so does its impact spot. If the mass transfer rate is large, the energy transfer rate can be comparable to the intrinsic luminosity of the detached component star. The position of the impact spot can be determined by the orbital period, mass ratio and the dimensionless potential. The temperature of the impact spot is very high, and it can be reflected by the humps on the light curves directly. 4. A rare Algol-type binary system V753 Mon that is just at the process of mass ratio inversion is discovered. The mass ratio of this binary is very close to one, and the key evolutional stage provides a important observational sample source for the theory of binary evolution.
Subject Area天文学
Pages85
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5980
Collection双星与变星研究组
Recommended Citation
GB/T 7714
张嘉. Algol型双星的观测研究[D]. 北京. 中国科学院研究生院(云南天文台),2013.
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