Abstract

The reduction of all the available photometry for the Cepheid CC Lyr has allowed its \(O-C\) diagram spanning a time interval of 124 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period (\(\varepsilon/P\approx 0.046\)). A formal fitting of the \(O-C\) residuals has made it possible to estimate the rate of secular increase in the period, \(dP/dt=229.3({\pm}{14.8})\) s yr\({}^{-1}\). The pulsation stability test proposed by Lombard and Koen (1993) has confirmed that the increase in the period is real.

中文翻译：

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二代造父变星CC Lyr时期的变化

摘要

对造父变星CC Lyr的所有可用光度学的减少，使得它的\（OC \）图跨越了124年的时间间隔得以构建。所获得的数据提供了该期间内存在较大随机波动的证据（\（\ varepsilon / P \ approx 0.046 \））。对\（OC \）残差的正式拟合使得有可能估算出该时期\（dP / dt = 229.3（{\ pm} {14.8}）\） s \\ {{ ^ {-1} \）。Lombard和Koen（1993）提出的脉动稳定性测试已经证实，这一时期的增加是真实的。