Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261l..81m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 261, Oct. 15, 1982, p. L81-L85.
Astronomy and Astrophysics
Astronomy
19
Photosphere, Stellar Atmospheres, Stellar Spectrophotometry, White Dwarf Stars, X Ray Astronomy, X Ray Spectra, Atmospheric Temperature, Emission Spectra, Extreme Ultraviolet Radiation, Heao 1, Stellar Coronas, Stellar Luminosity, Stellar Models, Stellar Temperature, Ultraviolet Spectra
Scientific paper
The soft X-ray spectrum of Sirius obtained by the HEAO 1 A-2 experiment is used to investigate the origin of the X-radiation from that system. It is shown that, if the emission is coronal, then the coronal temperature must be less than 150,000 K, and the coronal luminosity must be greater than 10 to the 33rd ergs/s. Such a corona conflicts severely with EUV observations and is physically untenable. White dwarf atmosphere models are fitted to the spectrum and it is shown that a photospheric temperature of 28,000 K is much more consistent with the data. The relative consistency of the soft X-ray, EUV, and UV observations of Sirius B is discussed and it is concluded that the evidence favors the white dwarf photosphere as the origin of the soft X-rays.
Basri Gibor
Kahn Steve M.
Lampton Michael
Martin Chris
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