Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150..232k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 2, Sept. 1985, p. 232-245.
Astronomy and Astrophysics
Astrophysics
43
Barium, Nuclear Fusion, Red Giant Stars, Stellar Composition, Abundance, Atmospheric Turbulence, Spectral Line Width, Stellar Luminosity, Stellar Mass, Stellar Temperature
Scientific paper
A model-atmosphere analysis of five barium stars is carried out, and a previous analysis of two others extended. The sample comprises types Ba 1, Ba 2, Ba 3, and Ba 5. High-resolution Reticon spectra recorded with the ESO Coude Echelle Spectrometer serve to determine abundances relative to the sun for typically 16 elements. The use of Reticon spectra improves the accuracy compared to previous analyses. Enhancements of s-process elements relative to iron by factors of 2 (HD 139195) to 30 (HD 92626) are found; neutron exposures span at least the range tau of about 0.06-0.6/mb. In the more extreme barium stars the C/O ratio is enhanced with respect to normal red giants by a factor 2.5 to 30.
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