The CH Stars. III. Heavy Element Abundances

Details The CH Stars. III. Heavy Element Abundances The CH Stars. III. Heavy Element Abundances

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1997v&link_type=abstract

Astronomical Journal v.104, p.1997-2004

Astronomy and Astrophysics

Astronomy

78

Stars: Giants, Stars: Abundances

Scientific paper

The s-process abundances in seven CH giants have been derived. Large enhancement of s-process elements relative to solar values are found, [s/Fe] = + 1.0 to +2.0. In addition, the heavy s-process peak elements (Ba through Sm) are relatively more enhanced than the light s-process peak elements (Sr,Y,Zr), the average ratio of heavy-to-light s-process elements in the CH stars is +0.9 dex. In addition, the abundance patterns are best fit by models in which seed nuclei are exposed to a single neutron irradiation instead of an exponentially decaying distribution of neutron exposures. These Abundance patterns are explained best if the source of neutrons for the s-process material in CH stars is the 13C(a,n)16O reaction.

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