疏散星团中盾牌座δ型脉动食双星的观测研究

δ Sct pulsating eclipsing binaries are special stars, which contain two characteristics,δ Sct pulsating characteristic and the eclipsing binary characteristic. Based on the eclipsing binary characteristic, the physical parameters such as mass, radius and luminosity of the system can be determined. It also can provide more stringent constraints for the star seismic model. The study of asteroseismology can directly detect the internal structure and evolution status of stars, which will provide the basis and test for the binary evolution model. The star cluster, a natural laboratory for studying stars, has a basic consistent element abundance, age, and so on, which will provide more restrictions on the calculation of stellar physical parameters. In recent years, with the rapid development of star seismology, the research of pulsating binary star has become a hot topic in the field of stellar physics. The project plans to study δ Sct pulsating eclipsing binaries in the open cluster, relying on the domestic independent telescope and Mexico international measurement, especially the SONG/50 BiN telescope can make the photometric and spectroscopic observations. Then, the high accuracy radial velocity and light curves can be obtained and the absolute physical parameters, mass, radius, luminosity can be determined. By analyzed the pulsating properties of the stars, the frequency, amplitude, surface gravity and average density can be calculated. Based on all of these, the relationship and influence between eclipsing binary stars and pulsating characteristics are studied.

盾牌座δ型脉动食双星是同时具有食双星和脉动特征的一类特殊天体。研究食双星系统可以精确的确定其质量，半径及光度等物理参数，从而为星震模型提供更严格的约束；而星震学的研究能直接探测到恒星内部结构和演化状态等信息，这将为双星演化模型提供依据和检验。星团作为研究恒星的天然实验室，它的成员星拥有基本一致的元素丰度、年龄等，这将为计算恒星物理参数提供更多限制。近年来随着星震学的快速发展脉动食双星的研究已成为恒星物理领域的热点前沿课题。本项目计划在疏散星团中研究盾牌座δ型脉动食双星，主要是从SONG项目50BiN望远镜观测过的所有疏散星团中搜寻此类双星作为观测目标，然后依托国内自主望远镜和墨西哥国际联测，得到多色光变曲线和高精度视向速度，分析数据确定其质量，半径，光度等物理参数；分析脉动特性得到恒星的震动信息，如频率、振幅和表面重力等。以此为基础系统研究双星特征与脉动特征之间的相互关系和相互影响。

本文主要研究目标是盾牌座δ型脉动食双星。首先挑选了一批此类双星的候选体，然后进行逐一观测。在观测过程中发现了一颗具有强烈耀发特征的特殊双星，通过测光和光谱的时序观测，最后经过分析得到了有趣的观测数据和研究结果，得到多色光变曲线和高精度视向速度，分析数据确定其质量，半径，光度等物理参数；并知道这是一颗活动性极强的主星充满洛希瓣的半相接双星，为双星的热弛豫震荡模型提供了有利的观测证据。然后对其它脉动食双星进行了仔细研究，分析脉动特性得到恒星的震动信息，如频率、振幅和表面重力等。通过对候选体的星震学研究直接探测恒星内部结构和演化状态等信息，为恒星结构演化模型提供依据和检验，并对双星理论提出了新的挑战和限制，对完善恒星结构演化理论具有重要的科学意义.