Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-12
Mon.Not.Roy.Astron.Soc. 360 (2005) 1085-1090
Astronomy and Astrophysics
Astrophysics
Accepted MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09103.x
We use a two-temperature hydrodynamical formulation to determine the temperature and density structures of the post-shock accretion flows in magnetic cataclysmic variables (mCVs) and calculate the corresponding X-ray spectra. The effects of two-temperature flows are significant for systems with a massive white dwarf and a strong white-dwarf magnetic field. Our calculations show that two-temperature flows predict harder keV spectra than one-temperature flows for the same white-dwarf mass and magnetic field. This result is insensitive to whether the electrons and ions have equal temperature at the shock but depends on the electron-ion exchange rate, relative to the rate of radiative loss along the flow. White-dwarf masses obtained by fitting the X-ray spectra of mCVs using hydrodynamic models including the two-temperature effects will be lower than those obtained using single-temperature models. The bias is more severe for systems with a massive white dwarf.
Cropper Mark
Ramsay Gavin
Saxton Curtis
Wu Kinwah
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