Subgiant CH stars. II - Chemical compositions and the evolutionary connection with barium stars

Details Subgiant CH stars. II - Chemical compositions and the evolutionary connection with barium stars Subgiant CH stars. II - Chemical compositions and the evolutionary connection with barium stars

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...77..515l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 77, Dec. 1991, p. 515-540.

Astronomy and Astrophysics

Astrophysics

129

Barium, Metallicity, Stellar Composition, Supergiant Stars, Abundance, Binary Stars, Carbon Stars, Stellar Evolution

Scientific paper

Chemical abundances in 15 subgiant CH stars, five barium stars, and four objects classified as metal-deficient barium stars are determined through model-atmosphere analyses of high-resolution photographic echelle spectrograms. The stars in each of these groups show enhanced surface abundances of carbon and the very heavy elements produced by s-process neutron-capture reactions. The atmospheric parameters of subgiant CH stars are found to be typical of F- and G-type main-sequence stars and subgiants. Barium stars are more luminous G- and K-type giants. Both classes of objects constitute about 1 percent of their respective populations, and exhibit a high incidence (about 100 percent) of the membership in wide spectroscopic binaries. Subgiant CH stars occur on the main sequence, but only in the T(eff) range 6000-6800 K. It is argued that subgiant CH stars are created when an AGB star in a wide binary contaminates its main-sequence companion with carbon and s-processed material.

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