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| Paper: |
Establishing HZ 43 A, Sirius B, and RXJ1856−37 as Soft X-ray Standards: a Cross-Calibration between the Chandra LETGS, the EUVE Spectrometer, and the ROSAT PSPC |
| Volume: |
372, 15th European Workshop on White Dwarfs |
| Page: |
221 |
| Authors: |
Beuermann, K.; Burwitz, V.; Rauch, T. |
| Abstract: |
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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