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Search for Evolutionary Changes in the Period of the Classical Cepheid EV Aql

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Abstract

The reduction of all the available photometry for the Cepheid EV Aql has allowed its \(O-C\) diagram spanning a time interval of 130 years to be constructed. This has made it possible to calculate the rate of evolutionary decrease in the period, \(dP/dt=-33.2({\pm}{6.9})\) s yr\({}^{-1}\), in agreement with the results of model calculations for the second crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen has confirmed that the decrease in the period is real.

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Funding

This work was supported by the Russian Foundation for Basic Research (project nos. 18-02-00890 and 19-02-00611).

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Correspondence to L. N. Berdnikov.

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Translated by N. Samus

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Berdnikov, L.N. Search for Evolutionary Changes in the Period of the Classical Cepheid EV Aql. Astron. Lett. 46, 388–399 (2020). https://doi.org/10.1134/S1063773720060018

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  • DOI: https://doi.org/10.1134/S1063773720060018

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