高振幅的δ Scuti变星AD CMi,GSC4464-0924的周期变化

Period Changes of the High-amplitude δ Scuti Stars: AD CMi,GSC 4464-0924

呈现了两颗高振幅的δScuti变星GSC 4464-0924和AD CMi的观测-计算(O-C)的光极大值时刻图.收集了31个GSC 4464-0924的极大值时刻和96个AD CMi的极大值时刻,利用O-C图对它们进行了周期分析,从它们的O-C图像上发现GSC 4464-0924的周期在逐渐增加,AD CMi的周期也在不断增加且O-C图像表现出三角函数形式的变化,因此它极有可能存在一个伴星.利用离散的傅里叶变换的方法获得了这个伴星的轨道参数.

We present observed-calculated （O-C） diagrams for two High-amplitude δ Scuti stars, GSC 4464 -0924 and AD CMi. The time of 31 light maximums of GSC 4464 -0924 and time of 96 light maximums of AD CMi are collected from the literatures. The O-C diagrams show that GSC 4464 -0924 and AD CMi have an increasing period. We also find that the O-C diagram of AD CMi presents a trigonometric function type period variation which indicates the existence of a companion star. By using the Discrete Fourier Transformation method, the orbital parameters of the companion star are obtained.