BVIc Observations and Search for Evolutionary Variations in the Cepheid V811 Oph Period

Autor:	N. P. Ikonnikova, D. V. Cheryasov, M. A. Burlak, N. I. Shatskii, S. V. Zhuiko, E. O. Mishin, L. N. Berdnikov, A. A. Belinskii
Rok vydání:	2020
Předmět:	Physics Brightness Stability test 010308 nuclear & particles physics Cepheid variable media_common.quotation_subject Astronomy and Astrophysics Astrophysics 01 natural sciences law.invention Photometry (optics) Telescope Space and Planetary Science Observatory law Sky 0103 physical sciences Instability strip 010303 astronomy & astrophysics media_common
Zdroj:	Astronomy Reports. 64:310-318
ISSN:	1562-6881 1063-7729
DOI:	10.1134/s1063772920040010
Popis:	For the first time, BVIc observations of the Cepheid V811 Oph were obtained by using a new 60‑cm telescope at the Caucasus Mountain Observatory, Sternberg Astronomical Institute, Moscow State University (SAI MSU). An $$O{-}C$$ diagram covering a time span of 124 years was plotted using photometry from old photographic and modern sky surveys. The diagram has a parabola shape, which made it possible to determine for the first time the quadratic elements of the brightness variations. Furthermore, it made it possible to calculate the rate of an evolutionary decrease in the period of V811 Oph $$dP{\text{/}}dt = - 0.00375( \pm 0.00177)$$ s/year, which is consistent with the theoretical calculation results for the second intersection of the instability strip if this Cepheid is a classical one. The pulsation stability test proposed by Lombard and Koen confirmed the actual decrease in the period.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::651b78cb86c92d43d495a1bcc6aa40b2 https://doi.org/10.1134/s1063772920040010 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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