Search for Evolutionary Changes in the Periods of Cepheids: V1033 Cyg, a Classical Cepheid at the First Crossing of the Instability Stripстатья
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Дата последнего поиска статьи во внешних источниках: 31 июля 2019 г.
Аннотация:For the classical Cepheid V1033 Cyg we have constructed an O–C diagram spanning a time interval of 117 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 = 18.19 (±0.08) s yr^−1, in agreement with the results of theoretical calculations for the first crossing of the instability strip. Thus, V1033 Cyg is the second actually observed Cepheid (after α UMi) that crosses the instability strip for the first time.