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White dwarf masses in cataclysmic variables are difficult to determineaccurately, but are fundamental for understanding binary system parameters, aswell as binary evolution. We investigate the X-ray spectral properties of asample of Intermediate Polars detected above 15 keV to derive the masses oftheir accreting white dwarfs. We use data from the Swift/BAT instrument whichduring the first 2.5 yrs of operation has detected 22 known intermediatepolars. The X-ray spectra of these sources are used to estimate the mass of thewhite dwarfs. We are able to produce a mass estimate for 22 out of 29 of theconfirmed intermediate polars. Comparison with previous mass measurements showsgood agreement. For GK Per, we were able to detect spectral changes due to thechanges in the accretion rate. The Swift/BAT detector with its combination ofsensitivity and all-sky coverage provides an ideal tool to determine accuratewhite dwarf masses in intermediate polars.

Intermediate polars in the Swift/BAT survey: Spectra and white dwarf masses