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Astronomy Letters

, Volume 45, Issue 4, pp 227–236 | Cite as

Search for Evolutionary Changes in the Periods of Cepheids: V1033 Cyg, a Classical Cepheid at the First Crossing of the Instability Strip

  • L. N. BerdnikovEmail author
  • 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
  • L. E. Keir
Article
  • 1 Downloads

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.

Keywords

Cepheids period variability stellar evolution 

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • L. N. Berdnikov
    • 1
    Email author
  • E. N. Pastukhova
    • 2
  • V. V. Kovtyukh
    • 3
  • B. Lemasle
    • 4
  • A. Yu. Kniazev
    • 1
    • 5
    • 6
  • I. A. Usenko
    • 2
    • 7
  • G. Bono
    • 8
    • 9
  • E. Grebel
    • 4
  • G. Hajdu
    • 4
    • 10
    • 11
  • S. V. Zhuiko
    • 1
  • S. N. Udovichenko
    • 3
  • L. E. Keir
    • 3
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia
  2. 2.Institute of AstronomyRussian Academy of SciencesMoscowRussia
  3. 3.Astronomical ObservatoryOdessa National UniversityOdessaUkraine
  4. 4.Center for AstronomyHeidelberg UniversityHeidelbergGermany
  5. 5.South African Astronomical ObservatoryObservatory, Cape TownSouth Africa
  6. 6.Southern African Large TelescopeObservatory, Cape TownSouth Africa
  7. 7.Nikolaev Astronomical ObservatoryNikolaevUkraine
  8. 8.Department of PhysicsUniversity of RomeRomeItaly
  9. 9.Rome Astronomical ObservatoryRomeItaly
  10. 10.Catholic University of ChileSantiagoChile
  11. 11.Institute of AstrophysicsSantiagoChile

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