VY Scl-type cataclysmic variable SDSS J154453.60+255348.8: stellar and disc parameters
Medina Rodriguez A.L. Zharikov S. Kára J. Wolf M. Agishev A. Khokhlov S.
1 June 2023Oxford University Press
Monthly Notices of the Royal Astronomical Society
2023#521Issue 45846 - 5859 pp.
We present a new study of the eclipsing cataclysmic variable SDSS J154453.60+255348.8 to determine the objects nature and its system parameters together with the probe of the accretion flow structure in the system. Based on analyses of new simultaneous time-resolved photometric and spectroscopic observations of SDSS J154453.60+255348.8 and using our light-curve modelling techniques and the Doppler tomography method, we found that the system contains a white dwarf with the mass of MWD = 0.62(7) M⊙ and an evolved red dwarf as a secondary. The system inclination is close to 90° and the mass ratio is q = 0.49(2). The secondary has an effective temperature T2 = 3400(40) K and a radius about 1.35(15) times larger than a zero-age main-sequence star with similar mass. From observation of the system in high- and low-brightness states, we conclude that SDSS J154453.60+255348.8 is a long-orbital period VY Scl-type system. The accretion disc in the high state is about two times less than the truncation radius, and is completely missing during the low state of the system.
binaries: close , novae, cataclysmic variables , stars: dwarf novae , stars: fundamental parameters , stars: individual: SDSS J154453.60+255348.8
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Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, AP 106, , BC, Ensenada, 22800, Mexico
Faculty of Mathematics and Physics, Astronomical Institute, Charles University, V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave. 71, Almaty, 050040, Kazakhstan
Instituto de Astronomía
Faculty of Mathematics and Physics
Faculty of Physics and Technology
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