Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...386..994f&link_type=abstract
Astronomy and Astrophysics, v.386, p.994-1000 (2002)
Astronomy and Astrophysics
Astrophysics
13
Methods: Numerical, Stars: Chromospheres, Stars: Coronae, Stars: Magnetic Fields, Mhd, Waves
Scientific paper
Theoretical chromospheric models described in the two previous papers of this series are used to study the relationship between the chromospheric emission and the filling factor. This theoretically determined relationship shows that the chromospheric emission flux in Ca II (H+K) is approximately proportional to the square root of the magnetic filling factor at the stellar surface. To relate the filling factor to stellar rotation rate, we compare the theoretical fluxes with observations of stars with known rotation period. The comparison shows that the Rossby number is probably a more appropriate measure of the rotation influence on activity of main-sequence stars than the rotation period. Our theoretical Mg II (h+k) and Ca II (H+K) emission fluxes are also found to be well correlated, which is in a good agreement with the observational data.
Fawzy Diaa
Musielak Zdzislaw E.
Rammacher Wolfgang
Stepien Kazimierz
Ulmschneider Peter
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