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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

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Abstract

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.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia

    L. N. Berdnikov, A. Yu. Kniazev & S. V. Zhuiko

  2. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    E. N. Pastukhova & I. A. Usenko

  3. Astronomical Observatory, Odessa National University, Shevchenko Park, ul. Marazlievskaya 1v, Odessa, 65014, Ukraine

    V. V. Kovtyukh, S. N. Udovichenko & L. E. Keir

  4. Center for Astronomy, Heidelberg University, Moenchhoffstrasse 12-14, Heidelberg, 69120, Germany

    B. Lemasle, E. Grebel & G. Hajdu

  5. South African Astronomical Observatory, P.O. Box 9, Observatory, Cape Town, 7935, South Africa

    A. Yu. Kniazev

  6. Southern African Large Telescope, P.O. Box 9, Observatory, Cape Town, 7935, South Africa

    A. Yu. Kniazev

  7. Nikolaev Astronomical Observatory, ul. Observatornaya 1, Nikolaev, 54030, Ukraine

    I. A. Usenko

  8. Department of Physics, University of Rome, via della Ricerca Scientifica 1, Rome, 00133, Italy

    G. Bono

  9. Rome Astronomical Observatory, via Frascati 33, Rome, 00040, Italy

    G. Bono

  10. Catholic University of Chile, av. V. Mackenna 4860, Macul, 782-0436, Santiago, Chile

    G. Hajdu

  11. Institute of Astrophysics, Santiago, Chile

    G. Hajdu

Authors
  1. L. N. Berdnikov
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  2. E. N. Pastukhova
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  3. V. V. Kovtyukh
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  4. B. Lemasle
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  5. A. Yu. Kniazev
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  6. I. A. Usenko
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  7. G. Bono
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  8. E. Grebel
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  9. G. Hajdu
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  10. S. V. Zhuiko
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  11. S. N. Udovichenko
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  12. L. E. Keir
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Corresponding author

Correspondence to L. N. Berdnikov.

Additional information

Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 4, pp. 269–278.

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Berdnikov, L.N., Pastukhova, E.N., Kovtyukh, V.V. et al. Search for Evolutionary Changes in the Periods of Cepheids: V1033 Cyg, a Classical Cepheid at the First Crossing of the Instability Strip. Astron. Lett. 45, 227–236 (2019). https://doi.org/10.1134/S1063773719040017

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  • DOI: https://doi.org/10.1134/S1063773719040017

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