Analysis of the white-light flickering of the intermediate polar V709 Cassiopeiae with wavelets and Hurst analysis

We characterize the flickering observed in the optical light curve of the intermediate polar system V709 Cas by determining its position in the α-Σ diagram of Fritz and Bruch classification scheme. The strength of flickering on a given timescale is represented by Σ, while α is the energy distribution of the flickering at different timescales. Here α is derived independently with both the wavelets and the Hurst R/S analysis. The flickering shows self-similarity on a timescale ranging from tens of minutes down to 10 s with stochastic persistent memory in time. The parameters α and Σ appear to be anticorrelated. In the α-Σ diagram, V709 Cas occupies in the region of magnetic systems. Since V709 Cas shows the spin period of the magnetic WD only in the X-ray but not in the optical, we conclude that this method can be used to characterize CV subtypes especially when their classification is uncertain.