Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1712l&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #17.12; Bulletin of the American Astronomical Society, Vol. 33, p.1336
Astronomy and Astrophysics
Astronomy
Scientific paper
Supersoft X-Ray Sources are most probably very hot white dwarfs undergoing steady nuclear burning in their envelopes. They are high luminosity (L > 0.1 L Edd), soft (kT≈ 50 eV) low mass binary with a white dwarf primary accreting at a sub-Eddington rate. High-resolution spectra in the soft X-rays are now becoming available with Chandra and XMM-Newton. Photospheric line spectroscopy has the potential to provide accurate diagnostics of the white dwarf properties. We have therefore embarked on a project aimed at providing new NLTE model atmospheres of supersoft sources. We are building a series of model atmospheres of hot white dwarfs (20<= kT<= 100 eV; 8<= log g<= 10) with various surface composition. The models incorporate the most abundant species, H, He, C, N, O, Ne, Mg, Si, S, and Fe, which are allowed to depart from Saha-Boltzmann statitics. Our models include the influence of multi-level model atoms, metal line blanketing, and Auger ionization on the atmospheric structure. A preliminary comparison of models calculated assuming coherent (Thomson) and non-coherent (Compton) scattering is presented. This work was supported through a NASA ATP grant (NRA 00-01-ATP-153).
Hubeny Ivan
Lanz Thierry
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