Establishing HZ 43 A, Sirius B, and RX J1856--37 as Soft X-ray Standards: a Cross-Calibration between the Chandra LETGS, the EUVE Spectrometer, and the ROSAT PSPC

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The absolute calibration of space-borne instruments in the soft X-ray regime rests strongly on model spectra of hot white dwarfs.
We analyze the Chandra LETG+HRC observations of the white dwarfs HZ 43 A and Sirius B and of the neutron star RX J185635-3754 in order to resolve current uncertainties in their soft X-ray spectral fluxes and photospheric parameters.
Our improved parameters fit the observations from the optical to the soft X-ray regime. We report the absolute spectral fluxes of the three stars at selected wavelengths and provide corrections to the effective areas of the Chandra LETG+HRC, the EUVE short-wavelength spectrometer, and the ROSAT PSPC. The results may aid the calibration of other space-borne instruments.

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