Abstract
For the low-amplitude Cepheid V532 Cyg we have constructed an O − C diagram spanning a time interval of 121 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 = −0.248 (±0.067) s yr−1, which points to the second crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen (1993) has confirmed that the period decrease is real.
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This work was supported by the Russian Foundation for Basic Research (project nos. 18-02-00890 and 19-02-00611).
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Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 10, pp. 731–740.
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Berdnikov, L.N. Search for Evolutionary Changes in the Periods of Cepheids: V532 Cyg. Astron. Lett. 45, 677–686 (2019). https://doi.org/10.1134/S1063773719100013
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DOI: https://doi.org/10.1134/S1063773719100013