Outer atmospheres of cool stars. XIII - Capella at critical phases

Details Outer atmospheres of cool stars. XIII - Capella at critical phases Outer atmospheres of cool stars. XIII - Capella at critical phases

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..223a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 223-233.

Astronomy and Astrophysics

Astrophysics

47

Binary Stars, Chromosphere, Cool Stars, Giant Stars, Stellar Coronas, Stellar Spectra, Ultraviolet Spectra, Dynamo Theory, Far Ultraviolet Radiation, Hertzsprung-Russell Diagram, High Dispersion Spectrographs, Stellar Evolution, Stellar Rotation

Scientific paper

The results are presented of a program of high-dispersion spectroscopy of Capella at critical orbital phases utilizing the International Ultraviolet Explorer. The considered program had the objective to establish as carefully as possible the relative ultraviolet emission levels of the Capella primary and secondary in order to obtain an understanding regarding the nature of their chromospheres and coronae. The results of the program confirm the earlier study of the Capella by Ayres and Linsky (1980), which was limited to orbital phases 0.50 and 0.75. Both programs found that the Capella secondary is considerably brighter than the primary, in surface flux, in all of the prominent far-ultraviolet emissions, particularly the high-excitation CII-CIV lines. In addition, the present study has revealed several puzzling aspects of the system. It is concluded that the Capella primary is comparatively bright, for a yellow giant, in far-ultraviolet and perhaps also in soft X-ray normalized fluxes. The implications of this conclusion are evaluated.

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