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A study of the long-term activity of five intermediate polars with accretion discs
- 1.0549281 - ASÚ 2022 RIV GB eng J - Journal Article
Šimon, Vojtěch
A study of the long-term activity of five intermediate polars with accretion discs.
Monthly Notices of the Royal Astronomical Society. Roč. 505, č. 1 (2021), s. 161-171. ISSN 0035-8711. E-ISSN 1365-2966
Institutional support: RVO:67985815
Keywords : accretion discs * magnetic fields * radiation mechanisms
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.235, year: 2021
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stab739
Intermediate polars (IPs) are cataclysmic variables with mildly magnetized white dwarfs (WDs). This analysis of the long-term optical activity of five examples of IPs with accretion discs used data from the Catalina Real-time Transient Survey, Digital Access to a Sky Century @ Harvard (DASCH) and the American Association of Variable Star Observers (AAVSO). It is shown that each of these IPs had their most preferred value of absolute magnitude M-opt, even if it significantly varied on the superorbital time-scale. The values of M-opt of these IPs were in the zone of thermal-viscous instability (TVI) of the disc most of the time. The properties of a series of outbursts of V426Oph can be explained by an intermittently operating TVI. The activity of TVCol and DWCnc is interpreted as caused by a gradually variable mass inflow rate from the secondary to a cool disc. The mass transfer rate from the secondary varied on a well-determined time-scale. It is shown that M-opt of EIUMa, close to the peaks of outbursts of non-magnetic dwarf novae, fluctuated on the time-scale of days, it also produced short flares, ascribed to the bursts of matter from the donor. HYLeo, with a presumably cool disc, fluctuated between its high and low states. A temporary brightening from an extended low state is ascribed to a short, intense burst of matter from the donor to the remaining cool disc or torus.
Permanent Link: http://hdl.handle.net/11104/0325305
Number of the records: 1