The carbon-to-iron ratio of metal-rich dwarfs - an analysis of 14 Herculis

Astronomy and Astrophysics – Astrophysics

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Carbon Stars, Dwarf Stars, Iron, K Stars, Late Stars, Metallic Stars, Abundance, Atmospheric Models, High Resolution, Line Spectra, Stellar Spectra

Scientific paper

High-resolution spectra and line-blanketed model atmospheres have been used to carry out abundance analyses of the strong-lined K dwarf 14 Her and the normal K dwarf 70 Oph A. Previous studies of high-resolution spectra of 14 Her are confirmed which have shown it to be metal-rich; an overall enhancement of a factor of 2.5 compared to both the sun and 70 Oph A is found. Relative abundances of all even-Z elements with respect to iron are found to be equal to the solar values in both stars. The uncertainties in the determination of carbon abundance, both in this and previous studies, are examined. When account is taken of these uncertainties, carbon-to-iron ratios determined for unevolved stars show little if any deviation from the solar value.

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