The Cepheids V371 Per and OGLE-LMC-CEP-2132: The First Crossing of the Instability Strip
- Authors: Berdnikov L.N.1, Pastukhova E.N.2
-
Affiliations:
- Sternberg Astronomical Institute, Moscow State University
- Institute of Astronomy, Russian Academy of Sciences
- Issue: Vol 49, No 4 (2023)
- Pages: 264-279
- Section: Articles
- URL: https://vestnikugrasu.org/0320-0108/article/view/674301
- DOI: https://doi.org/10.31857/S0320010823040010
- EDN: https://elibrary.ru/CUEGMC
- ID: 674301
Cite item
Abstract
For both periods of the double-mode Cepheid V371 Per and for the Cepheid OGLE-LMC-CEP-2132 we have constructed
diagrams spanning a time interval of 126 and 119 years, respectively. The
diagrams have the shape of parabolas, which has allowed us for the first time to determine the quadratic light elements and to calculate the rates of evolutionary changes in their periods: @ s yr-1 and @ s yr-1 for the fundamental mode and the first overtone of V371 Per, @espectively, and @ s yr-1 for OGLE-LMC-CEP-2132, in agreement with the results of theoretical calculations for the first crossing of the instability strip. The pulsation stability test proposed by Lombard and Koen has confirmed that the increase in the periods is real.
About the authors
L. N. Berdnikov
Sternberg Astronomical Institute, Moscow State University
Email: lberdnikov@yandex.ru
119234, Moscow, Russia
E. N. Pastukhova
Institute of Astronomy, Russian Academy of Sciences
Author for correspondence.
Email: lberdnikov@yandex.ru
109017, Moscow, Russia
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