Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..369d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 369-378.
Astronomy and Astrophysics
Astronomy
38
Late Stars, Stellar Composition, Calcium, Local Thermodynamic Equilibrium, Stellar Atmospheres
Scientific paper
Detailed simultaneous radiative transfer-statistical equilibrium calculations have been undertaken for neutral calcium using model stellar atmospheres corresponding to a variety of late spectral types. The results are used to investigate non-LTE effects and trends with differing stellar parameters, and to estimate the likely influence of departures from LTE on model atmosphere analyses. The behavior of individual Ca I atomic levels and lines is discussed in connection with calculations carried out for a model atmosphere corresponding to the K0 III giant Pollux (beta Gem). Non-LTE effects in Ca I in solar-type dwarf stars are likely to be insignificant, but are expected to become increasingly significant toward lower gravity stars, with individual multiplets indicating widely different abundances in giant stars.
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