相接双星O'Connell效应的统计和观测研究

The investigation of O'Connell effect is one of the most challenging and active subjects of binary research field in recent years. This project will carry out statistical and observational research on O'Connell effect of contact binaries. Firstly, we will find the contact binaries that are both observed by LAMOST and each survey project, by combining spectroscopic and photometric data, we can determine the relationship between the magnetic activity and O'Connell effect and derive the relationship between the strength of magnetic activity and the significant level of O'Connell effect based on statistical study, this will provide reliable statistical evidence for explaining O'Connell effect of contact binaries by magnetic activity. Secondly, according to the observations and analysis, and by collecting physical parameters and orbital period variations of all contact binaries that exhibit O'Connell effect, we will construct the maximum sample database of contact binaries and discuss the correlation between the strength and variation of O'Connell effect and physical parameters and orbital period variations of all targets, this will provide statistical and observational evidence for enriching and improving theoretical model of O'Connell effect.

O'Connell效应的研究是近年来双星研究领域最具挑战性和最具活力的课题之一。本项目将对相接双星的O'Connell效应进行统计和观测研究。首先，找出LAMOST和各项巡天计划共同观测的相接双星，结合光谱和测光数据，统计得出磁活动与O'Connell效应的关系，并得出磁活动的强弱与O'Connell效应显著程度的关系，为磁活动解释相接双星O'Connell效应提供可靠的统计证据。其次，通过观测及分析和搜集文献统计出所有具有O'Connell效应的相接双星的物理参数以及轨道周期变化，做一个最大样本的相接双星数据库，探讨O'Connell效应强度和变化与所有样本目标物理参数及轨道周期变化的相关性，为O'Connell效应理论模型的丰富和完善提供统计和观测依据。

O’Connell效应是指食双星光变曲线两极大不等高的现象。这一效应的解释主要有两种：磁场黑子模型和吸积热斑，到底哪一种解释更可靠、更有可能还需要进一步研究和确认。在本项目的支持下，发表SCI论文17篇，使用国内外1米级望远镜对50多颗相接双星进行了观测和研究，这些目标大部分都表现出O’Connell效应，我们通过主星或次星上的黑子成功解释了它们的O’Connell效应，这一系列工作从观测上得到了O’Connell效应最有可能的理论解释，即磁场黑子模型，解决了长期以来O’Connell效应没有确定理论解释的难题。同时，20多个目标获得了LAMOST低分辨率光谱数据，我们使用光谱减技术对其分析，发现所有目标都存在磁活动指示线，说明它们都具有色球活动，并且还发现这些目标的Hα发射线等值宽度越大，光变曲线的O’Connell效应越明显，进一步为磁场黑子活动解释O’Connell效应提供了证据。