Rotational Evolution of the Magnetic White Dwarfs in Intermediate Polars

We provide the results of the long-term multicolour photometric monitoring of selected intermediate polars MU Cam, V405 Aur, FO Aqr, EX Hya, V1323 Her, V2306 Cyg, obtained at different observatories. We analysed variability of the spin period of the white dwarf using our observations and previously published spin maxima timings. We found that some of these stars show spin-up, some show spin-down, sometimes we see no spin period variability and sometimes we may see more complicated changes of the spin periods. For some binary systems we studied also orbital period variations.