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X-Ray Emission from Hot DA White Dwarfs - EXOSAT Results and Implications for Atmospheric Models

Paerels, Frits; Heise, John

We present the observations of the photospheric X-ray spectra of hot DA white dwarfs, obtained with the 500 lines mm ^-1 Transmission Grating Spectrometer on EXOSAT. These spectra cover the full soft X-ray band, at high wavelength resolution and statistical quality. They allow us to do an accurate measurement of the photospheric paramete…