The high-resolution photospheric soft X-ray spectrum of Sirius B

Details The high-resolution photospheric soft X-ray spectrum of Sirius B The high-resolution photospheric soft X-ray spectrum of Sirius B

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..849p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 849-854, 859-862. SRON-ZWO-supported research.

Other

24

Abundance, Hot Stars, Photosphere, Stellar Spectra, White Dwarf Stars, X Ray Spectra, Exosat Satellite, Lyman Spectra, Stellar Atmospheres

Scientific paper

The authors present the high-resolution soft X-ray spectrum of the hot white dwarf Sirius B, as measured with the 500 lines mm-1 transmission grating spectrometer on EXOSAT. The X-rays are of purely photospheric origin. Using a large grid of model atmospheres, the authors determine the effective temperature of Sirius B with high accuracy. It is shown that a consistent description of the complete electromagnetic spectrum of Sirius B, from optical to X-ray wavelengths, is now possible. This solution requires Te to be in the range 25,000 - 26,000K, dependent on the choice of the other parameters, and the gravity to be in the range log g = 8.5 - 8.7.

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