Search for Evolutionary Changes in the Periods of Cepheid: DX GemстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2019 г.
Аннотация:For the low-amplitude Cepheid DX Gem we have constructed an O − C diagram spanning a
time interval of 120 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 = −0.808(±0.108) s yr−1, which points to the second crossing of the instability strip. The available data reduced by the Eddington–Plakidis method show random period fluctuations, ε/P ≈ 0.0072, whose amplitude on the O − C diagram is comparable to the amplitude of evolutionary changes.