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Title: Discovery of a pre-cataclysmic binary with unusual chromaticity of the eclipsed white dwarf by the GPX survey
Authors: Krushinsky, V.
Benni, P.
Burdanov, A.
Antokhin, I.
Antokhina, E.
Jehin, E.
Barkaoui, K.
Fitzsimmons, A.
Gibson, C.
Gillon, M.
Popov, A.
Baştürk, Ö.
Benkhaldoun, Z.
Marchini, A.
Papini, R.
Salvaggio, F.
Brazhko, V.
Issue Date: 2020
Publisher: Oxford University Press
Citation: Discovery of a pre-cataclysmic binary with unusual chromaticity of the eclipsed white dwarf by the GPX survey / V. Krushinsky, P. Benni, A. Burdanov, et al. — DOI 10.1093/mnras/staa547 // Monthly Notices of the Royal Astronomical Society. — 2020. — Vol. 493. — Iss. 4. — P. 5208-5217.
Abstract: We report the discovery of a relatively bright eclipsing binary system, which consists of a white dwarf (WD) and a main-sequence K7 star with clear signs of chromospheric and spot activity. The light curve of this system shows ∼0.2 mag ellipsoidal variability with a period of 0.297549 d and a short total eclipse of the WD. Based on our analysis of the spectral and photometric data, we estimated the parameters of the system. The K7V star is tidally deformed but does not fill its Roche lobe (the filling factor is about 0.86). The orbital inclination is i = 73◦.1 ± 0◦.2, and the mass ratio is q = M2/M1 ≈ 0.88. The parameters of the K7V star are M2 ≈ 0.64 M☉, R2 = 0.645 ± 0.012R☉, and T2 ≈ 4070 K. The parameters of the WD are M1 ≈ 0.72 M☉, R1 = 0.013 ± 0.003R☉, and T1 = 8700 ± 1100 K. Photometric observations in different bands revealed that the maximum depth of the eclipse is in the SDSS r filter, which is unusual for a system of a WD and a late main-sequence star. We suspect that this system is a product of the evolution of a common-envelope binary star, and that the WD accretes the stellar wind from the secondary star (the so-called low-accretion-rate polar, hereafter LARP). © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85099640228
PURE ID: 13179662
ISSN: 358711
DOI: 10.1093/mnras/staa547
metadata.dc.description.sponsorship: The work of VK was partially supported by the Ministry of science and higher education of Russian Federation, topic FEUZ-2020-0038. The work of IA (light curves analysis) was supported by the Russian Science Foundation (RSF) grant 17-12-01241. The work of EA was supported by the Program of development of M.V. Lomonosov Moscow State University (the Leading Scientific School ‘Physics of stars, relativistic objects and galaxies’). OB thanks (TÜB˙TAK) for partial support in using the T100 telescope with project numbers 19AT100-1346. AB would like to thank Dr. Amaury Triaud for helpful discussions about the system. TRAPPIST-North is a project funded by the University of Liege, in collaboration with Cadi Ayyad University of Marrakech (Morocco). TRAPPIST is a project funded by the Belgian Fonds (National) de la Recherche Scientifique (F.R.S.-FNRS) under grant FRFC 2.5.594.09.F. E.J and M.G are F.R.S-FNRS Senior Research Associates.
RSCF project card: 17-12-01241
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