Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..279a&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 279-299.
Astronomy and Astrophysics
Astronomy
110
Cool Stars, Late Stars, Stellar Atmospheres, Stellar Rotation, Stellar Spectra, Stellar Temperature, Ultraviolet Astronomy, Chromosphere, Iue, Stellar Magnetic Fields, Stellar Spectrophotometry, Stellar Winds, Ultraviolet Spectra, X Ray Astronomy
Scientific paper
UV spectra of Capella (G6 III + F9 III) obtained with the IUE are analyzed. High-resolution emission-line profiles taken near the elongation at phase 78 days suggest that virtually all of the emission in transition-region lines and most of the emission in chromospheric lines comes from the late-F secondary of the system. It is suggested that the origin of the extraordinary activity levels on these otherwise very similar stars can be traced to the one property that is obviously different, i.e., rotation. The Capella primary is a normal sharp-line slow rotating giant, whereas the secondary has broader lines and is a rapid rotator for a late-type giant.
Ayres Thomas R.
Linsky Jeffrey L.
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