Studies of heavy-element synthesis in the Galaxy. II - A survey of e-, r-, and s-process abundances

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Abundance, Dwarf Stars, Heavy Elements, Nuclear Fusion, Stellar Structure, G Stars, Giant Stars, Late Stars, Milky Way Galaxy, Spectral Line Width, Stellar Evolution

Scientific paper

Results are presented of a survey designed to search for variations in the relative abundances of e-, r-, and s-process elements in G-type dwarfs. Specifically, the abundances of Fe (e-process), Eu (r-process), and Ba (s-process) are examined in some 32 stars with as wide a range of ages, galactic orbits, and compositions as possible. No completely convincing relative abundance variations are found to a limit of plus or minus 25 percent, although a slight enhancement of Eu in certain halo stars may be indicated. Abundances of Eu, Ba, and La are examined in the extreme halo giant HD 122563 and are found to be consistent with, but not as yet to prove, a nuclear (neutron exposure) history for the matter in that star different than the one in the sun and most other stars.

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