New calculations using two independent, rigorous numerical methods confirm the effects of Compton energy redistribution in photon-electron scattering events are completely negligible for the interpretation of X-ray spectra of DA white dwarfs such as Sirius B and HZ43. Differences between emergent spectra of Compton and Thomson cases are in fact much smaller than the predicted spectral uncertainties resulting from uncertainties in the current knowledge of the fundamental parameters of stars such as HZ43. We have found that differences between Compton effects predicted here for HZ43 and the calculations of Madej (1998) are caused by approximations used in the solution of the transfer equation in the former work; the results presented here supersede the earlier ones. We conclude that current non-LTE model atmosphere spectra of hot DA white dwarfs neglecting Compton scattering can be safely used for the calibration low energy detectors of X-ray observatories for the foreseeable future.
