VZ Cnc光变周期的再分析

PERIOD CHANGE REANALYSIS OF VZ Cnc

本文给出了1985年和1990年观测VZ Cnc得到的9个光度极大时刻,加上搜集以往文献得到的,共有144个极大时刻,时间跨度为40年.对它的光变周期及其变化进行的分析表明,周期变化率β比文献中给出的小,且β=—(1.7±0.4)×10^(-11)天/天;另外,用以往文献中计算拍频位相的方法得到的新极大时刻的位相值,与用光变曲线轮廓确定的拍频位相值相比较,约差0.2.分析了拍频周期后,给出新值:P_b=0.716284±0.000004天.

9 new moments of maxima for the δ Scuti star VZ Cnc were determined in 1985 and 1990 with the 60 cm reflector at Xinlong Station of Beijing Astronomical Observatory. Together with other data, we get 144 moments of maxima. Analysis of the light period and its change indicates that the pulsation period has a changerate β=dp/dt=—(1.7±0.4)×10^(-11) d/d, which is smaller than that in literature. In addition, after discussion of the bear period and phase we consider that the beat period given by Fitch is changeable or not strictly accurate, and a new beat period P_b= (0.7162844±0.000004) day is given.