Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-28
Astron.Astrophys.458:541-552,2006
Astronomy and Astrophysics
Astrophysics
15 pages, 9 figures
Scientific paper
10.1051/0004-6361:20065478
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-S observations of the white dwarfs HZ43 A and Sirius B and of the neutron star RX J185635-3754 in order to resolve current uncertainties in the soft X-ray spectral fluxes and photospheric parameters of the three stars. We have obtained improved parameters for which fit the observations from the optical to the soft X-ray regime. Our approach allows us to quote their absolute spectral fluxes at selected wavelengths which may aid the calibration of other space-borne instruments.
Beuermann Klaus
Burwitz Vadim
Rauch Thomas
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