Search for Evolutionary Changes in the Periods of Cepheids: BY Cas
- Authors: Berdnikov L.N.1
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Affiliations:
- Sternberg Astronomical Institute
- Issue: Vol 45, No 9 (2019)
- Pages: 593-601
- Section: Article
- URL: https://journals.rcsi.science/1063-7737/article/view/191516
- DOI: https://doi.org/10.1134/S1063773719090019
- ID: 191516
Cite item
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
About the authors
L. N. Berdnikov
Sternberg Astronomical Institute
Author for correspondence.
Email: berdnik@sai.msu.ru
Russian Federation, Universitetskii pr. 13, Moscow, 119992