Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..827r&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, Aug. 1, 1977, p. 827-835.
Astronomy and Astrophysics
Astrophysics
13
Giant Stars, Late Stars, M Stars, Thermodynamic Equilibrium, Atmospheric Ionization, Calcium, Forbidden Transitions, K Stars, Line Spectra, Stellar Spectra
Scientific paper
Photoelectric scans of the Ca I line at 6572 A and the forbidden Ca II transition at 7323 A are studied in the K giant alpha Tau, the M supergiant alpha Ori, and the M giants beta And, alpha Cet, mu Gem, and beta Peg. The relative strengths of these lines are shown to be indicative of the ratio of the relative number densities of the neutral and ionized species in the photosphere. The analysis indicates an overionization relative to LTE in qualitative agreement with the theoretical calculations of Auman and Woodrow for the K and M giants. The M supergiant alpha Ori exhibits a large overionization relative to LTE.
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