Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201..212a&link_type=abstract
Astrophysical Journal, vol. 201, Oct. 1, 1975, pt. 1, p. 212-221.
Astronomy and Astrophysics
Astrophysics
27
Balmer Series, Chromosphere, Radiative Transfer, Stellar Atmospheres, Absorption Spectra, Astronomical Models, Giant Stars, H Lines, Line Spectra, Resonant Frequencies, Solar Spectra, Stellar Spectra
Scientific paper
The formation of the Balmer-series member H-epsilon in the near-red wing of the Ca II H line is discussed for two cases: the sun (H-epsilon absorption profile) and Arcturus (H-epsilon emission profile). It is shown that although the H-epsilon source functions in both stars are dominated by the Balmer-continuum radiation field through photoionizations, the line-formation problems in the two stars are quantitatively different, owing to a substantial difference in the relative importance of the stellar chromosphere temperature inversion as compared with the stellar photosphere.
Ayres Thomas R.
Linsky Jeffrey L.
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