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Title:
A grid of model atmospheres for metal-deficient giant stars. I
Authors:
Gustafsson, B.; Bell, R. A.; Eriksson, K.; Nordlund, A.
Affiliation:
AA(Astronomiska Observatorium, Uppsala, Sweden; Maryland, University, College Park, Md.), AB(Maryland, University, College Park, Md.), AC(Astronomiska Observatorium, Uppsala, Sweden), AD(Stockholm, Universitet, Stockholm; Astronomiska Observatorium, Uppsala, Sweden)
Publication:
Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 407-432. Research supported by the Swedish National Science Research Council, Danish Research Council, and NSF; (A&A Homepage)
Publication Date:
09/1975
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GIANT STARS, METALLIC STARS, STELLAR ATMOSPHERES, STELLAR TEMPERATURE, ASTRONOMICAL MODELS, ATMOSPHERIC MODELS, GALACTIC EVOLUTION, LINE SPECTRA, STELLAR SPECTROPHOTOMETRY
Comment:
A&AA ID. AAA014.064.026
Bibliographic Code:
1975A&A....42..407G

Abstract

A grid of flux-constant model atmospheres for stars with effective temperatures between 3750 and 6000 K, log g between 0.75 and 3.0, and (A/H) between -3.0 and 0.0 has been constructed. The line absorption is approximated by opacity distribution functions. Metal lines and molecular lines, including those from the infrared bands of CO and CN, are taken into account. The variation of the structure of the models with metal abundance and microturbulence parameter is found to be quite regular and not very drastic. The surface cooling produced by CO is important for all the models with a maximum temperature of 5000 K, while CN mainly causes a backwarming effect but is not very important for solar CNO abundances. The effects of convection, estimated by using the mixing-length approximation, are important only for the coldest models. The models compare very well with models from overlapping regions of other grids. A solar model consistent with the grid models is found to agree satisfactorily with empirical solar model atmospheres. The careful use of scaled solar models for stars with (A/H) approximately equal to zero is justified.

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