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Changes in the Period of V420 Cen, a W Vir-Type Cepheid

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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.

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Funding

This study was supported by the Russian Foundation for Basic Research (project nos. 18-02-00890 and 19-02-00611).

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  1. Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Universitetskii pr. 13, Russia

    L. N. Berdnikov

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  1. L. N. Berdnikov
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Correspondence to L. N. Berdnikov.

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Translated by N. Samus’

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Berdnikov, L.N. Changes in the Period of V420 Cen, a W Vir-Type Cepheid. Astron. Lett. 47, 105–116 (2021). https://doi.org/10.1134/S106377372102002X

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