Search for evolutionary changes in the periods of Cepheids: BY Casстатья
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Дата последнего поиска статьи во внешних источниках: 1 апреля 2020 г.
Аннотация:For the low-amplitude Cepheid BY Cas we have constructed an O − C diagram spanning a time interval 123 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 increase in the period, dP/dt = +0.985 (±0.091) s yr −1 , which points to the third crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen (1993) confirms that the period