A fine analysis of calcium and iron lines in the spectrum of the K0 giant Pollux - Accurate fundamental parameters

Details A fine analysis of calcium and iron lines in the spectrum of the K0 giant Pollux - Accurate fundamental parameters A fine analysis of calcium and iron lines in the spectrum of the K0 giant Pollux - Accurate fundamental parameters

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250...89d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 89-102.

Astronomy and Astrophysics

Astronomy

58

Calcium, Fine Structure, Giant Stars, Iron, K Stars, Line Spectra, Stellar Spectra, Stellar Atmospheres, Stellar Composition, Stellar Models, Visible Spectrum

Scientific paper

This paper describes a model atmosphere analysis of calcium and iron lines in the spectrum of the bright K0 giant Pollux. The assumption of LTE is initially retained throughout a coarse analysis in which the proprieties of various model atmospheres are examined and approximate values for the atmospheric parameters are derived. A fine analysis follows in which an empirical model atmosphere, based on the observed profile of the Ca II 8542 A line, is constructed. The parameter results obtained include T(e) = 4865 + or - 50 K, surface gravity log g = 2.75 + or - 0.15 dex, logarithmic iron abundance relative to the sun (Fe/H) = -0.0-4 + or - 0.05 dex, logarithmic calcium abundance (relative to H = 12.00) = Ca/H = 6.25 + or - 0.1 dex, and the microturbulence is 1.4 + or - 0.1 km/s. Weak, high-excitation Fe I lines appear to be formed in conditions close to LTE. The spectroscopic mass of Pollux is derived to be 1.7 solar.

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