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Search for Evolutionary Changes in the Periods of Cepheids: CF Cas

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Abstract

For the classical Cepheid CF Cas we have constructed an O-C diagram spanning a time interval of 129 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 decrease in the period, dP/dt = −0.050 (±0.006) syr−1, in agreement with the results of theoretical calculations for the second crossing of the instability strip. The available data reduced by the Eddington-Plakidis method show no random period fluctuations, i.e., the parabola on the O-C diagram reflects a real evolutionary decrease in the period.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia

    L. N. Berdnikov

  2. Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya ul. 48, Moscow, 119017, Russia

    E. N. Pastukhova

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  1. L. N. Berdnikov
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  2. E. N. Pastukhova
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Correspondence to L. N. Berdnikov.

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Berdnikov, L.N., Pastukhova, E.N. Search for Evolutionary Changes in the Periods of Cepheids: CF Cas. Astron. Lett. 45, 92–103 (2019). https://doi.org/10.1134/S1063773719020014

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  • DOI: https://doi.org/10.1134/S1063773719020014

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