Spectroscopic analysis of Pollux relative to the sun with special reference to Arcturus

Details Spectroscopic analysis of Pollux relative to the sun with special reference to Arcturus Spectroscopic analysis of Pollux relative to the sun with special reference to Arcturus

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92...70r&link_type=abstract

Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 70-85. Research supported by the Deutsche Forschungsgemeinschaft an

Astronomy and Astrophysics

Astrophysics

122

Red Giant Stars, Stellar Atmospheres, Stellar Spectrophotometry, Spectroscopic Analysis, Stellar Evolution, Sun

Scientific paper

A model-atmosphere analysis of the MK K0 III standard Pollux (Beta Gem) is presented which is based on high-resolution photographic and FTS spectra. Stellar surface parameters are found to be effective temperature equals 4840 + or - 50 K, and log g equals 2.24 + or - 0.35. In conjunction with the radius, R equals 9.1 solar radii, this value of log g leads to a mass (0.2-1.2 solar masses) for Pollux 2.3 times that of Arcturus. Recent controversy concerning the gravity of Arcturus is critically examined. Evidence is found for chromospheric inhomogeneities, large-scale photospheric flow patterns (giant granules), and severe departures from LTE that vitiate abundances derived from low-excitation lines of neutral atoms. The chemical composition determined for 30 elements, lithium to thorium, characterizes Pollux as a normal Population I object with a mean deficiency of the heavy elements (Z not less than 20) equals -0.17.

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