Simulating AXAF Grating Spectra of Accreting White Dwarfs
Allyn F. TennantES-84 Space Science Laboratory, NASA Marshall Space Flight Center, Huntsville, AL 35812, USA;Kinwah WuResearch Centre for Theoretical Astrophysics, School of Physics, University of Sydney, NSW 2006, Australia;Stephen L. O’DellES-84 Space Science Laboratory, NASA Marshall Space Flight Center, Huntsville, AL 35812, USA;Martin C. WeisskopfES-01 Space Science Laboratory, NASA Marshall Space Flight Center, Huntsville, AL 35812, USA;
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Аннотация
Abstract We present simulated AXAF spectra of accreting white dwarfs, using parameters appropriate for magnetic cataclysmic variables. The very high spectral resolution that can be obtained with the High-Energy Transmission Grating of AXAF can resolve the keV X-ray emission lines that characterise the temperature, density and velocity profiles of the shock-heated emission regions of these systems. These simulations demonstrate that actual spectra will allow us to place constraints on the white-dwarf mass and the accretion rate of the systems. The high-resolution spectra also allow the measurement of the velocity of the accretion flow in regions close to the white-dwarf surface.
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