Search for Evolutionary Changes in the Periods of Cepheids: CF Casстатья
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Дата последнего поиска статьи во внешних источниках: 19 июня 2019 г.
Аннотация:For the classical Cepheid CF Cas we have constructed an O−C diagram spanning a time
interval of 129 years. The O−C diagram has the shape of a parabola, which has made it possible to
determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in
the period, dP/dt = −0.050 (±0.006) s yr −1 , in agreement with the results of theoretical calculations for
the second crossing of the instability strip. The available data reduced by the Eddington–Plakidis method
show no random period fluctuations, i.e., the parabola on the O−C diagram reflects a real evolutionary
decrease in the period.