两子星半径都不小于各自内临界等位面等体积球半径80%的密近双星，还分为近相接半接。
接近相接双星 near-contact binary
In the first section of the present paper, the definition, classification and some observational characters of near contact binaries are introduced. Further more, some methods about photometric study of near contact binary are simply illustrated.
本文首先介绍了近相接双星的定义、分类以及观测特征，然后对近相接双星的测光研究方法进行了综述。
参考来源 - 近相接型密近双星的观测研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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