Search for Evolutionary Changes in the Period the Cepheid ET Vulстатья
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Дата последнего поиска статьи во внешних источниках: 7 октября 2020 г.
Аннотация:The reduction of all the available photometry for the Cepheid ET Vul has allowed its O − Cdiagram spanning a time interval of 130 years to be constructed. This has made it possible to calculate for the first time the rate of evolutionary decrease in the period, dP/dt = −426.5 (±29.7) s/yr, in agreementwith the results of model calculations for the second crossingof the instability strip. The pulsation stability test proposed by Lombard and Koen has confirmed that the evolutionary change in the period is real.