Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120...21k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 1, April 1983, p. 21-35.
Astronomy and Astrophysics
Astrophysics
37
Abundance, Atmospheric Models, Red Giant Stars, Stellar Atmospheres, Stellar Evolution, Supergiant Stars, Atmospheric Ionization, Barium, Iron, Line Spectra, Manganese, Spectral Energy Distribution, Stellar Color, Stellar Spectrophotometry, Stellar Temperature, Thermodynamic Equilibrium
Scientific paper
A model atmosphere analysis of three cool giants (β Cet, α Tau, α TrA) and one supergiant (ɛ Peg) is presented. One of the principal reasons for the analysis being the search for possible non-LTE effects, the measured lines are split into high excitation lines and low excitation lines in order to test the sensitivity of the ionization balance method against deviations from LTE. Even though for iron no pronounced split can be found to occur, other elements, e.g. Mn and Ni, hint at the existence of deviations from LTE in cool giant stars. Deviations from the solar abundance pattern are found for the elements of medium atomic number. Two of the stars (α TrA and ɛ Peg) display over-abundances in barium.
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