The period-gap cataclysmic variable CzeV404 Her: A link between SW Sex and SU UMa systems

0548106 - ASÚ 2022 RIV FR eng J - Journal Article
Kára, J. - Zharikov, S.V. - Wolf, M. - Kučáková, Hana - Cagaš, P. - Medina Rodriguez, A. L. - Mašek, Martin
The period-gap cataclysmic variable CzeV404 Her: A link between SW Sex and SU UMa systems.
Astronomy & Astrophysics. Roč. 652, August (2021), č. článku A49. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT EF16_013/0001403; GA MŠMT LTT17006; GA MŠMT(CZ) EF18_046/0016007
Research Infrastructure: CTA-CZ II - 90105
Institutional support: RVO:67985815 ; RVO:68378271
Keywords : novae * cataclysmic variables * fundamental parameters
OECD category: Astronomy (including astrophysics,space science); Astronomy (including astrophysics,space science) (FZU-D)
Impact factor: 6.240, year: 2021
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202140958

We present a new study of the eclipsing cataclysmic variable CzeV404 Her (P-orb = 0.098 d) that is located in the period gap. We found that the system has a massive white dwarf M-WD = 1.00(2) M-circle dot, a mass ratio of q = 0.16, and a relatively hot secondary with an effective temperature T-2 = 4100(50) K. The system inclination is i = 78.8 degrees. The accretion disk spreads out to the tidal limitation radius and has an extended hot spot or line region. The hot spot or line is hotter than the remaining outer part of the disk in quiescence or in intermediate state, but does not stand out completely from the disk flux in (super)outbursts. We claim that this object represents a link between two distinct classes of SU UMa-type and SW Sex-type cataclysmic variables. The accretion flow structure in the disk corresponds to the SW Sex systems, but the physical conditions inside the disk fit the behaviour of SU UMa-type objects.
Permanent Link: http://hdl.handle.net/11104/0324222