The hydrogen Lyman-alpha emission of Capella

Details The hydrogen Lyman-alpha emission of Capella The hydrogen Lyman-alpha emission of Capella

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..710a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 710-720.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Emission Spectra, G Stars, Hydrogen, Lyman Alpha Radiation, Astronomical Catalogs, Astronomical Models, Iue, Stellar Atmospheres, Stellar Spectrophotometry, Stellar Winds

Scientific paper

We describe the hydrogen Ly-alpha emission of the spectroscopic binary Capella (G8 III + GO III) recorded at 0.1 A resolution by the International Ultraviolet Explorer. The overt changes in the composite line shape with orbital phase are controlled by the active GO III star and permit a dissection of the stellar components despite the obliteration of the central portion of the profile by atomic hydrogen and deuterium absorption along the 12.5 pc sightline. The Ly-alpha line shape of the active GO III star is surprisingly asymmetric and possibly is variable. Both characteristics suggest a stellar wind of moderate excitation (20,000-100,000 K), a key component of the coronal evolution scenario of Simon and Drake (1989) for the Hertzsprung-gap giants.

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