The many faces of Capella - A search for rotational modulations and a study of systematic velocities of emission lines in the ultraviolet

Details The many faces of Capella - A search for rotational modulations and a study of systematic velocities of emission lines in the ultraviolet The many faces of Capella - A search for rotational modulations and a study of systematic velocities of emission lines in the ultraviolet

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..784a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 784-798.

Astronomy and Astrophysics

Astrophysics

28

Binary Stars, Iue, Red Shift, Stellar Atmospheres, Stellar Rotation, Ultraviolet Spectra, Balmer Series, Emission Spectra, Far Ultraviolet Radiation, Photosphere, Solar Magnetic Field

Scientific paper

The ultraviolet emission of the spectroscopic binary Capella has been monitored with IUE over the course of half an orbital cycle (2 months). The first objective was to detect changes in the fluxes or shapes of ultraviolet emission lines in response to the evolution of large-scale active regions or their rotation onto and off the visible hemisphere of the active F-type secondary star. Capella proved to be surprisingly steady in its ultraviolet emissions. The second objective was to investigate systematic velocities of the low-excitation and high-excitation emission lines. It is found that the latter are significantly redshifted with respect to the former. The author concludes that the redshifts indicate true downflows of 105K plasma in the stellar "transition zone", rather than the operation of a "P Cygni" effect in an optically thick outflow.

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