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Search for evolutionary changes in the periods of cepheids: V1033 Cyg, a classical cepheid at the first crossing of the instability strip

For the classical Cepheid V1033 Cyg we have constructed an O—C diagram spanning a time interval of 117 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...

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Main Authors: Berdnikov, L. N. (Author) , Pastukhova, E. N. (Author) , Kovtyukh, V. V. (Author) , Lemasle, Bertrand (Author) , Kniazev, A. Yu. (Author) , Usenko, I. A. (Author) , Bono, G. (Author) , Grebel, Eva K. (Author) , Hajdu, Gergely (Author) , Zhuiko, S. V. (Author) , Udovichenko, S. N. (Author) , Keir, L. E. (Author)
Format: Article (Journal)
Language:English
Published: 2019
In: Astronomy letters
Year: 2019, Volume: 45, Issue: 4, Pages: 227-236
ISSN:1562-6873
DOI:10.1134/S1063773719040017
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1134/S1063773719040017
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Author Notes:L.N. Berdnikov, E.N. Pastukhova, V.V. Kovtyukh, B. Lemasle, A. Yu. Kniazev, I.A. Usenko, G. Bono, E. Grebel, G. Hajdu, S.V. Zhuiko, S.N. Udovichenko, and L.E. Keir
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Summary:For the classical Cepheid V1033 Cyg we have constructed an O—C diagram spanning a time interval of 117 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 = 18.19 (±0.08) syr−1, in agreement with the results of theoretical calculations for the first crossing of the instability strip. Thus, V1033 Cyg is the second actually observed Cepheid (after α UMi) that crosses the instability strip for the first time.
Item Description:Gesehen am 05.03.2020
Physical Description:Online Resource
ISSN:1562-6873
DOI:10.1134/S1063773719040017

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