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Astronomy Letters

, Volume 45, Issue 9, pp 593–601 | Cite as

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

  • L. N. BerdnikovEmail author
Article
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Abstract

For the low-amplitude Cepheid BY Cas we have constructed an O − C diagram spanning a time interval 123 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 increase in the period, dP/dt = +0.985 (±0.091) s yr−1, which points to the third crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen (1993) confirms that the period increase is real.

Keywords

Cepheids period variability stellar evolution 

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Notes

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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© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia

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