Photoelectric observations of Sirius B

Details Photoelectric observations of Sirius B Photoelectric observations of Sirius B

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..185r&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 2, Oct. 1977, p. 185-188. Research supported by the Oesterreichischer Fonds zur Foerde

Astronomy and Astrophysics

Astrophysics

16

Brightness Temperature, Ubv Spectra, White Dwarf Stars, Binary Stars, Light Scattering, Stellar Temperature

Scientific paper

Photoelectric area-scanner measurements of Sirius B are presented which consist of three sets each of UBV and uvby-beta observations. These measurements show that Sirius B is not unusual with respect to other DA white dwarfs, being characterized by a V magnitude of approximately 8.44, (B-V) of the order of -0.03, (U-B) of about -1.04, (b-y) of approximately -0.04, m1 of about 0.17, an H-beta magnitude of approximately 2.77, and (u-b) of the order of 0.05. An effective temperature of 32,000 K is adopted on the basis of various photoelectric calibrations. The observations do not support the previously proposed young age of Sirius B; it is concluded that the description of the reddish color of Sirius by Ptolemy and Seneca is apparently unrelated to the evolutionary status of Sirius B.

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