Search for Evolutionary Changes in the Periods of Cepheids: BG CruстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2019 г.
Аннотация:For the low-amplitude Cepheid BG Cru we have constructed an O−C diagram spanning a time interval 118 years. The O−C diagram has the shape of a parabola, which has made it possible to determine for the first timethe quadratic light elements and to calculate the rate of evolutionary decrease in the period, dP/dt = −0.0787 (±0.0230) s yr−1. This points to the second crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen(1993) confirms that the period decrease is real.