On the effective temperature of Sirius B

Details On the effective temperature of Sirius B On the effective temperature of Sirius B

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72..376k&link_type=abstract

Astronomy and Astrophysics, vol. 72, no. 3, Feb. 1979, p. 376, 377.

Astronomy and Astrophysics

Astronomy

8

Stellar Atmospheres, Stellar Models, Stellar Temperature, White Dwarf Stars, X Ray Astronomy, Atmospheric Models, Graphs (Charts), Ubv Spectra

Scientific paper

Expected X-ray count rates in the ANS soft X-ray band are computed for white-dwarf model atmospheres with effective temperatures of 25,000, 30,000, and 40,000 K. An effective temperature of 22,500 + or - 600 K and log g of 8.85 + or - 0.27 are derived for Sirius B from an analysis of recently observed UBV and uvby colors. An effective temperature of 27,400 + or - 1000 K is also determined for Sirius B, on the basis of the Hamada-Salpeter (1961) mass-radius relation for white dwarfs. Comparison of the effective-temperature results with the theoretical X-ray count rates indicates that the soft X-rays emitted by the Sirius system probably are not of thermal origin.

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