Changes in the Period of the Population II Cepheid CC Lyrстатья
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Дата последнего поиска статьи во внешних источниках: 12 мая 2021 г.
Аннотация:The reduction of all the available photometry for the Cepheid CC Lyr has allowed its O−Cdiagram spanning a time interval of 124 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period (ε/P ≈ 0.046). A formal fitting of the O−C residuals has made it possible to estimate the rate of secular increase in the period, dP/dt = 229.3(±14.8) s/yr. The pulsation stability test proposed by Lombard and Koen (1993) has confirmed that the increase in the period is real.