Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..407k&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, May 1985, p. 407-417.
Astronomy and Astrophysics
Astronomy
17
Abundance, Stellar Composition, Stellar Evolution, Subgiant Stars, Lithium, Metallicity, Stellar Atmospheres, Stellar Spectra
Scientific paper
New high-resolution, high signal-to-noise-ratio spectra have been gathered for subgiant CH stars HD 4395 and HD 216219. A detailed model-atmosphere abundance analysis has been carried out, with emphasis on the determination of abundances for elements heavier than iron. The heavy-element abundance patterns in the two stars are quite similar, and appear to have been produced by neutron exposures (tau = 0.2) which are less than those in the typical classical barium star. The abundance patterns indicate that the source of neutrons could have been either the C-13(alpha, n)O-16 reaction or the Ne-22(alpha, n)Mg-25 reaction. The evolutionary states of these stars are rediscussed in light of these new results.
Krishnaswamy K.
Sneden Chistopher
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