Simulating AXAF grating spectra of accreting white dwarfs

We present simulated AXAF spectra of accreting white dwarfs, using paramete rs appropriate for magnetic cataclysmic variables. The very high spectral r esolution that can be obtained with the High-Energy Transmission Grating of AXAF can resolve the keV X-ray emission lines that characterise the temper ature, density and velocity profiles of the shock-heated emission regions o f these systems. These simulations demonstrate that actual spectra will all ow us to place constraints on the white-dwarf mass and the accretion rate o f the systems. The high-resolution spectra also allow the measurement of th e velocity of the accretion flow in regions close to the white-dwarf surfac e.