Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172..111s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 111-123.
Astronomy and Astrophysics
Astrophysics
158
Chromosphere, Cool Stars, Radiant Flux Density, Stellar Activity, Stellar Magnetic Fields, Stellar Structure, Late Stars, Line Spectra, Stellar Coronas, X Ray Spectra
Scientific paper
Tight power-law relations between chromospheric, transition-region, and coronal surface flux densities of late-type stars are obtained, provided that a lower-limit flux φ is subtracted from radiative flux densities originating in the lower chromosphere. The author determines lower-limit, or basal, flux densities φi that optimize correlation coefficients for power-law relations between the soft X-ray flux density and the chromospheric excess flux density (Fi-φi) in the Ca II H and K, Mg II h and k, and Si II resonance lines.
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