Magnetic structure in cool stars. IX - Ultraviolet emission lines from chromospheres and transition regions

Details Magnetic structure in cool stars. IX - Ultraviolet emission lines from chromospheres and transition regions Magnetic structure in cool stars. IX - Ultraviolet emission lines from chromospheres and transition regions

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154..185o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. 185-196. Research supported by the Stichting Astro

Astronomy and Astrophysics

Astronomy

63

Chromosphere, Cool Stars, Stellar Magnetic Fields, Stellar Spectra, Ultraviolet Astronomy, Dwarf Stars, Line Spectra, Magnetoactivity, Radiant Flux Density, Silicon, Stellar Luminosity

Scientific paper

A compilation of ultraviolet fluxes from 132 stars in the IUE catalog is analyzed in order to study the power-law relations for chromospheric and transition region lines. Flux-flux plots covering 5 decades for transition-region lines and 3.5 decades for chromospheric lines indicate tight power-law relations in the case of single stars, particularly FK Comae stars and most binary stars. The relations are found to be independent of spectral type or luminosity class. Departures from the obtained flux-flux relations are found in the case of emission line dwarfs, and F-type and G-type contact binaries, respectively. The tightness of the relations between the emission fluxes from different temperature regimes suggests that the overall structure and heating of the outer atmospheres of cool stars are determined by a single parameter. A summary of the measured IUE images is given.

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