Mathematics – Logic
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l..67s&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 2, p. L67-L69. Research supported by the Research Corp.
Mathematics
Logic
71
Atmospheric Composition, Stellar Atmospheres, White Dwarf Stars, X Ray Sources, Abundance, Atmospheric Models, Helium, Thermal Emission
Scientific paper
X-ray fluxes are calculated for several model atmospheres for Sirius B and are compared with observations of soft X-rays from the Sirius system. Observed and predicted X-ray counting rates are also compared. The analysis confirms that the effective temperature of Sirius B is around 32,000 K and that this white dwarf is the source of the observed soft X-rays. It is concluded that the soft X-ray flux from Sirius B can be logically explained as thermal emission from the deep layers of a helium- and metal-poor white dwarf atmosphere. The consistency of two of the model atmospheres with observations of hydrogen line profiles, UBV and far-UV photometry, and soft X-ray observations suggests that hot DA white dwarfs could be a significant class of soft X-ray sources.
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