Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mnras.169..147f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 169, Oct. 1974, p. 147-155.
Astronomy and Astrophysics
Astronomy
36
Balmer Series, Late Stars, Line Spectra, Stellar Atmospheres, Stellar Spectra, Astronomical Spectroscopy, Atmospheric Temperature, Chromosphere, Dwarf Stars, Giant Stars, H Lines, K Lines
Scientific paper
The classification of the source functions of some strong spectral lines in the atmospheres of late-type stars is discussed. Using Arcturus as an example it is shown that the H-epsilon emission seen in some late-type giants is the result of a photoelectrically controlled source function. In the cool dwarfs however the emission sometimes seen in the Balmer series and some strong neutral metal resonance lines results, like the Ca II H and K emission, from a chromospheric temperature rise coupled with a collisionally controlled source function.-
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