On the spin and orbital variability of the intermediate polars

TL;DR

This paper reviews long-term photometric observations of intermediate polars, revealing spin period variability, superhump variations, and orbital phase modulation, enhancing understanding of their magnetic and orbital dynamics.

Contribution

It provides new observational insights into spin and orbital variability in intermediate polars, including confirmed superhump variations and spin-up characteristics.

Findings

Spin period variability in V2306 Cygni

Strong negative superhumps in RX J2133.7+5107

Orbital phase modulation of spin phases in MU Camelopardalis

Abstract

We present a review of the results of long-term photometric monitoring of selected magnetic cataclysmic binary systems, which belong to a class named "Intermediate polars". We found a spin period variability in the V2306 Cygni system. We confirm the strong negative superhump variations in the intermediate polar RX J2133.7+5107 and improved a characteristic time of white dwarf spin-up in this system. We have investigated the periodic modulation of the spin phases with the orbital phase in MU Camelopardalis. We can propose simple explanation as the influence of orbital sidebands in the periodic signal produced by intermediate polar.