A grid of model atmospheres for metal-deficient giant stars. I

Details A grid of model atmospheres for metal-deficient giant stars. I A grid of model atmospheres for metal-deficient giant stars. I

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..407g&link_type=abstract

Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 407-432. Research supported by the Swedish National Science Research

Astronomy and Astrophysics

Astrophysics

997

Giant Stars, Metallic Stars, Stellar Atmospheres, Stellar Temperature, Astronomical Models, Atmospheric Models, Galactic Evolution, Line Spectra, Stellar Spectrophotometry

Scientific paper

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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