Galactic Astronomy Workshop Proceedings Book
Disk Truncation and Structure in Nonmagnetic Cataclysmic VariablesŞölen Balman
Cataclysmic variables (CVs) are close binary systems with a white dwarf (WDs) as the primary. They are excellent environments to study accretion flows, gas dynamics, outflows, transient outbursts, and explosive nuclear burning under a variety of astrophysical plasma conditions. I will discuss how flickering variability studies in X-rays can be probes to determine accretion history and spectra. Some CVs demonstrate band limited noise in the optical, UV and X-ray energy bands, which can be adequately explained in the framework of the model of propagating fluctuations. The frequency breaks of nonmagnetic systems in the range (1-6) mHz indicates an optically thick disk truncation allowing us to study disk structure, optically thick-thin disk transition conditions. The existing frequency breaks and time lags between X-ray and the UV show that accretion flows in the inner disks of nonmagnetic systems are advective hot flows. I discuss nonmagnetic CVs in terms of their broadband noise characteristics and extrapolate relations to XRBs (X-ray binaries) and AGNs (Active Galactic Nuclei).