binaries: close; binaries: eclipsing; stars: low-mass; white dwarfs; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] 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 = M[SUB]2[/SUB]/M[SUB]1[/SUB] ≈ 0.88. The parameters of the K7V star are M[SUB]2[/SUB] ≈ 0.64 M[SUB]☉[/SUB], R[SUB]2[/SUB] = 0.645 ± 0.012R[SUB]☉[/SUB], and T[SUB]2[/SUB] ≈ 4070 K. The parameters of the WD are M[SUB]1[/SUB] ≈ 0.72 M[SUB]☉[/SUB], R[SUB]1[/SUB] = 0.013 ± 0.003R[SUB]☉[/SUB], and T[SUB]1[/SUB] = 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).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Krushinsky, Vadim; Ural Federal University, 620002 Yekaterinburg, Russian Federation
Benni, Paul; Acton Sky Portal (Private Observatory), Acton, MA 01720, USA
Burdanov, Artem; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA ; Instituto de Astrofísica de Canarias, E-38205 San Cristóbal de La Laguna, Santa Cruz de Tenerife, Spain
Antokhin, Igor; Sternberg State Astronomical Institute, Moscow State University, Universitetsky prospect, 13, 119992 Moscow, Russian Federation
Antokhina, Eleonora; Sternberg State Astronomical Institute, Moscow State University, Universitetsky prospect, 13, 119992 Moscow, Russian Federation
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Fitzsimmons, Alan; Astrophysics Research Centre, Queen's University Belfast, Belfast BT7 1NN, UK
Gibson, Christopher; Astrophysics Research Centre, Queen's University Belfast, Belfast BT7 1NN, UK
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Popov, Alexander; Ural Federal University, 620002 Yekaterinburg, Russian Federation
Baștürk, Özgür; Department of Astronomy and Space Science, Faculty of Science, Ankara University, TR-06100 Tandogan, Ankara, Turkey
Benkhaldoun, Zouhair; Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Av. Abdelkrim Khattabi, 40000, Marrakesh, Morocco
Marchini, Alessandro; Astronomical Observatory - DSFTA, University of Siena, Via Roma 56, I-53100 Siena, Italy
Papini, Riccardo; Wild Boar Remote Observatory, San Casciano in Val di Pesa (FI), 50026, Italy
Salvaggio, Fabio; Wild Boar Remote Observatory, San Casciano in Val di Pesa (FI), 50026, Italy
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