Abstract

The reduction of all the available photometry for the Cepheid V420 Cen has allowed its \(O-C\) diagram spanning a time interval of 131 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period (\(\varepsilon/P\approx 0.021\)). Fitting the \(O-C\) residuals by a cubic parabola has made it possible to estimate the rate of secular decrease in the period, \(dP/dt=-353.0({\pm}{3.6})\) s yr\({}^{-1}\). The pulsation stability test proposed by Lombard and Koen in 1993 has confirmed that the decrease in the period is real.

中文翻译：

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W Vir型造父变星V420 Cen的周期变化

摘要

Cepheid V420 Cen的所有可用光度法的减少，使得它的\（OC \）图跨越了131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 0.021 \））。通过三次抛物线拟合\（OC \）残差，可以估算出该时期\（dP / dt = -353.0（{\ pm} {3.6}）\） s \\ {} ^ {-1} \）。Lombard和Koen在1993年提出的脉动稳定性测试已证实该时期的减少是真实的。