Ultraviolet observations of alpha Aurigae from Copernicus

Details Ultraviolet observations of alpha Aurigae from Copernicus Ultraviolet observations of alpha Aurigae from Copernicus

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...200l..27d&link_type=abstract

Astrophysical Journal, vol. 200, Aug. 15, 1975, pt. 2, p. L27-L31.

Astronomy and Astrophysics

Astronomy

61

Binary Stars, Emission Spectra, Lyman Alpha Radiation, Spaceborne Astronomy, Stellar Spectrophotometry, Ultraviolet Spectra, Line Spectra, Oao 3, Oxygen Spectra, X Ray Astronomy, X Ray Stars

Scientific paper

Emission lines of L-alpha (1215.67 A) and O VI (1031.94 A) were detected in the spectroscopic binary alpha Aur (Capella) with the Princeton experiment on Copernicus. Temperatures of the emitting regions are inferred to be in excess of 300,000 K. The temperature and emission measure are consistent with a variable source of soft X-rays. If the emission is attributed to the primary star (G5 III), the atmosphere is expanding with velocities of about 20-100 km/s. Such expansion can lead to material within the binary system. The density of interstellar hydrogen inferred from absorption of stellar L-alpha appears to be approximately 0.01 hydrogen atoms per cu cm.

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