Changes in the Period of V420 Cen, a W Vir-Type Cepheidстатья
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Дата последнего поиска статьи во внешних источниках: 28 июля 2021 г.
Аннотация:The reduction of all the available photometry for the Cepheid V420 Cen has allowed its O − Cdiagram 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 (ε/P ≈ 0.021). Fitting the O − C residualsby a cubic parabola has made it possible to estimate the rate of secular decrease in the period, dP/dt = −353.0(±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.