Other
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..700k&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 700-712.
Other
104
Chromosphere, Dwarf Stars, Emission Spectra, K Lines, Stellar Atmospheres, Stellar Models, Calcium, Data Correlation, Flare Stars, Late Stars, Line Shape, Main Sequence Stars, Photosphere, Ultraviolet Spectra
Scientific paper
High-resolution Ca II K line profiles are used to model the upper photospheres and lower chromospheres of eight main-sequence stars ranging in spectral type from F0 to M0 and exhibiting different degrees of chromospheric activity. The model chromospheres are studied as a function of spectral type and activity for stars of similar spectral type in order to obtain evidence of enhanced nonradiative heating in the upper-photospheric models and in the ratio of minimum temperature at the base of the chromosphere to effective temperature, a correlation between activity and temperature in the lower chromospheres, and a correlation of the width at the base of the K-line emission core and at the K2 features with activity. Chromospheric radiative losses are estimated for the modelled stars and other previously analyzed main-sequence stars. The results obtained strengthen the argument that dMe flare stars exhibit fundamentally solar-type activity but on an increased scale.
Kelch Walter L.
Linsky Jeffrey L.
Worden Simon P.
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