VY Scl-type cataclysmic variable SDSS J154453.60+255348.8: stellar and disc parameters

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10475226" target="_blank" >RIV/00216208:11320/23:10475226 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=.ZbGGjZ1cK" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=.ZbGGjZ1cK</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stad881" target="_blank" >10.1093/mnras/stad881</a>

Result language
angličtina
Original language name
VY Scl-type cataclysmic variable SDSS J154453.60+255348.8: stellar and disc parameters
Original language description
We present a new study of the eclipsing cataclysmic variable SDSS J154453.60+255348.8 to determine the object's 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 M-WD = 0.62(7) M-circle dot and an evolved red dwarf as a secondary. The system inclination is close to 90 degrees and the mass ratio is q = 0.49(2). The secondary has an effective temperature T-2 = 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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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