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Eclipsing System PS UMa: Evolutionary Status and Physical Parameters of the Components

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Abstract

We present the first high accuracy UBVRI(RI)c CCD light curves of the newly discovered eclipsing system PS UMa = GSC 4375 1733 (\(P = 9_{·}^{d}27\), \(V = 12_{·}^{m}42\)). The photometric solutions are found, the physical parameters of the components are derived. The eccentricity of the orbit was found to be negligible e = 0.074, which made it difficult to measure the rate of the apsidal rotation. High accuracy of our observations allowed us to find the reliable parameters of the system. Components (Sp = F7 + G1) have advanced significantly in their evolution, the age of the system is 2.4 billion years. The mass and the radius of G1 component is larger and it is ahead of the F7 component in its evolution. The model of the system best suits the theory in the absence of the overshooting in the core. Obtained from our observations photometrical parallax π = 0\(_{.}^{\prime\prime }\)00102(2) coincides with GAIA DR2 value \(\pi =0_{·}^{\prime\prime }00106(3)\) within their errors. The new EW type variable with period \( \approx {\kern 1pt} 0_{·}^{d}40\) was found in the field of PS UMa.

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ACKNOWLEDGMENTS

The observations were fulfilled with 1-m and 60-cm reflectors of Simeiz observatory of INASAN. This work has used the SIMBAD database of the Strasbourg Center for Astronomical Data (France) and the bibliographic reference service of the ADS (NASA, USA). We thank the anonymous referee for important and useful comments.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Lomonosov Moscow State University, 119992, Moscow, Russia

    I. M. Volkov & A. S. Kravtsova

  2. Institute of Astronomy of the Russian Academy of Sciences, 119017, Moscow, Russia

    I. M. Volkov & A. S. Kravtsova

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  1. I. M. Volkov
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  2. A. S. Kravtsova
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Correspondence to I. M. Volkov or A. S. Kravtsova.

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This work was partially supported by a scholarship of Slovak Academic Information Agency SAIA, by RFBR grants 18-502-12025 and 11-02-01213a, RNF grant 14-12-00146. We appreciate the support from the Program of development of M.V. Lomonosov Moscow State University (Leading Scientific School “Physics of stars, relativistic objects and galaxies”).

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Volkov, I.M., Kravtsova, A.S. Eclipsing System PS UMa: Evolutionary Status and Physical Parameters of the Components. Astron. Rep. 64, 211–225 (2020). https://doi.org/10.1134/S1063772920030051

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