The chemical compositions of two subgiant CH stars

Details The chemical compositions of two subgiant CH stars The chemical compositions of two subgiant CH stars

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..810s&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 1, p. 810-817.

Astronomy and Astrophysics

Astrophysics

42

Abundance, Carbon Compounds, Giant Stars, Stellar Atmospheres, Stellar Spectra, Main Sequence Stars, Molecular Spectra, Nitrogen, Scandium, Spectrum Analysis, Tables (Data)

Scientific paper

Model-atmosphere analyses of the atmospheres of two 'subgiant CH stars,' HD 176021 and HD 20413 are presented. These stars are found to possess small, but definite, iron-peak-element deficiencies, substantial overabundances of the s-process elements and large, nearly solar, surface gravities. An excess scandium abundance is attributed to weak s-process irradiation on some of the lighter elements in the stellar material. Overabundances of carbon but normal abundances of nitrogen are derived through spectrum synthesis. The derived log g values lead to absolute magnitudes near Mv = +4. HD 176021 and HD 204613 are interpreted as highly evolved Population II stars that have recently returned to the vicinity of the main sequence as a consequence of extensive internal mixing.

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