SWIFT XRT Observations of the Nova-like Cataclysmic Variables MV Lyr, BZ Cam and V592 Cas
Solen Balman, Patrick Godon, and Edward M. Sion

TL;DR
This study uses SWIFT XRT observations to analyze the boundary layer characteristics of three nova-like cataclysmic variables, revealing high-temperature, optically thin emission and possible ADAF-like flows, with implications for understanding their accretion processes.
Contribution
First detailed X-ray spectral analysis of boundary layers in non-magnetic nova-like CVs, suggesting ADAF-like flows and wind outflows as key features.
Findings
Boundary layers exhibit high virial temperatures (21-50 keV).
Detection of power-law components indicating Compton scattering effects.
X-ray luminosities are a small fraction (~0.001-0.01) of disk luminosities.
Abstract
We present a total of ~ 45 ksec (315 ksec) of SWIFT XRT observations for three non-magnetic nova-like (NL) Cataclysmic Variables (CVs) (MV Lyr, BZ Cam, V592 Cas) in order to study characteristics of Boundary Layers (BL) in CVs. The nonmagnetic NLs are found mostly in a state of high mass accretion rate (110 Msun yr) and some show occasional low states. Using the XRT data, we find optically thin multiple-temperature cooling flow type emission spectra with X-ray temperatures (kT) of 21-50 keV. These hard X-ray emitting boundary layers diverge from simple isobaric cooling flows indicating X-ray temperatures that are of virial values in the disk. In addition, we detect power law emission components from MV Lyr and BZ Cam and plausibly from V592 Cas which may be a result of the Compton scattering of the optically thin emission from the fast wind…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Astrophysical Phenomena and Observations · Astronomical Observations and Instrumentation
