Ruthenium and hafnium abundances in giant and dwarf barium stars

Aims.We present abundances for Ru and Hf, compare them to abundances of other heavy elements, and discuss the problems found in determining Ru and Hf abundances with laboratory gf-values in the spectra of barium stars. Methods.We determined Ru and Hf abundances in a sample of giant and dwarf barium...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2007-10, Vol.474 (1), p.221-228
Main Authors: Allen, D. M., Porto de Mello, G. F.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
stars: abundances
stars: chemically peculiar
stars: late-type
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Summary:Aims.We present abundances for Ru and Hf, compare them to abundances of other heavy elements, and discuss the problems found in determining Ru and Hf abundances with laboratory gf-values in the spectra of barium stars. Methods.We determined Ru and Hf abundances in a sample of giant and dwarf barium stars, by the spectral synthesis of two $\ion{Ru}{i}$ (λ4080.574 and λ4757.856) and two $\ion{Hf}{ii}$ (λ4080.437 and λ4093.155) transitions. The stellar spectra were observed with FEROS/ESO, and the stellar atmospheric parameters lie in the range 4300 
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20066735