Abstract
We present the first high accuracy UBVRI(RI)c CCD light curves of the poorly investigated eclipsing system V680 Mon = GSC 7428 218 (P = 8.54d, V = 10.02m). They were used to find the photometric solutions and to derive the physical characteristics of the components. The highest known eccentricity e = 0.613 was found in the class of systems with eccentric orbits. The orientation of the orbital ellipse ω = 357° is not convenient for apsidal motion investigation. High accuracy of our observations allows to find the reliable parameters of the system: M1 = 3.3\({{M}_{ \odot }}\) (B7 V), M2 = 1.8\({{M}_{ \odot }}\) (A2 V). We estimate the age of the components to be 70 mega-years. The photometric parallax π = 0.00109(1)″, derived from our observations, is two times smaller than the value π = 0.0025(9)″ from GAIA DR1, affected by the presence of the K3 V optical companion of the investigated star. The light curves solution demonstrates the presence of a third light, which can be assigned to a star of A4 V spectral class. The light time effect is found in the minima timings, so the source of the third light is physically connected to the eclipsing system. The parameters of the third body orbit are derived.
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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.
Funding
This work was partially supported by a scholarship of Slovak Academic Information Agency SAIA (ASK, IMV), RNF grant 14-12-00146 (IMV), RFBR grant 11-02-01213a (IMV) and by the Slovak Research and Development Agency under the contract No. APVV-15-045 (DC) and grant VEGA 2/0031/18 (DC). 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. & Chochol, D. The Physical Parameters of V680 Mon—Eclipsing Star with the Highest Known Eccentricity. Astron. Rep. 65, 184–202 (2021). https://doi.org/10.1134/S1063772921020062
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DOI: https://doi.org/10.1134/S1063772921020062