The star CQ Tau belongs to the family of UX Ori type stars and is characterized by very complicated photometric behavior and a complex structure of its circumstellar environment. Based on published photometric data, in this article we construct a light curve for this star covering 125 years. It implies that besides a random component characteristic of UX Ori type stars, the changes in brightness also include a large amplitude periodic component with a period of 10 years. It existence was suspected previously and new observations confirm its reality. This indicates the existence of a second component in the neighborhood of the star. Matter flows and density waves caused by the motion of the companion lead to periodic changes in the circumstellar extinction and brightness of the star. This result is discussed in the context of recent observations of CQ Tau with high angular resolution.

CQ Tau 恒星属于 UX Ori 型恒星家族，具有非常复杂的光度行为和复杂的星周环境结构。根据已发表的光度数据，在本文中我们构建了这颗恒星长达 125 年的光变曲线。这意味着，除了UX Ori型恒星的随机成分特征外，亮度变化还包括周期为10年的大幅周期成分。之前人们怀疑它的存在，新的观察证实了它的真实性。这表明在恒星附近存在第二个成分。伴星运动引起的物质流和密度波导致恒星的星周消光和亮度发生周期性变化。