Changes in the Period of V420 Cen, a W Vir-Type Cepheid

Changes in the Period of V420 Cen, a W Vir-Type Cepheid

The reduction of all the available photometry for the Cepheid V420 Cen has allowed its diagram spanning a time interval of 131 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period ( ). Fitting the residuals by a cubic parabola has m...

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Veröffentlicht in:Astronomy letters 2021-02, Vol.47 (2), p.105-116
1. Verfasser: Berdnikov, L. N.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
Astrophysics and Astroparticles
Cepheid variables
Observations and Techniques
Physics
Physics and Astronomy
Stability tests
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Zusammenfassung:The reduction of all the available photometry for the Cepheid V420 Cen has allowed its diagram spanning a time interval of 131 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period ( ). Fitting the residuals by a cubic parabola has made it possible to estimate the rate of secular decrease in the period, s yr . The pulsation stability test proposed by Lombard and Koen in 1993 has confirmed that the decrease in the period is real.
ISSN:1063-7737
1562-6873
DOI:10.1134/S106377372102002X