منابع مشابه
Analysis of 26 Barium Stars ⋆ , ⋆ ⋆ I . Abundances
Context. We present a detailed analysis of 26 barium stars, including dwarf barium stars, providing their atmospheric parameters (T eff , log g, [Fe/H], v t) and elemental abundances. Aims. We aim at deriving gravities and luminosity classes of the sample stars, in particular to confirm the existence of dwarf barium stars. Accurate abundances of chemical elements were derived. Abundance ratios ...
متن کاملRuthenium 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 g f -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 Ru (λ4080.574 and λ4757.856) and two Hf (λ4080.4...
متن کاملCopper and Barium Abundances in the Ursa Major Moving Group
We present Cu and Ba abundances for 7 G-K dwarf stars, members of the solarmetallicity, 0.3 Gyr old Ursa Major Moving Group. All analyzed member stars show [Ba/Fe] excesses of +0.3-plus, associated with [Cu/Fe] deficiencies of up to −0.23 dex. The present results suggest that there is an anti-correlation between the abundances of Cu and the heavy elements produced by the main component of the n...
متن کاملBeat Cepheids as Probes of Stellar and Galactic Metallicity: the New Ags Abundances
It is well known that the mere location of a Beat Cepheid model in a Period Ratio vs. Period diagram (Petersen diagram) puts constraints on its metallicity Z . But these bounds are sensitive to the mix of elements that are lumped into the parameter Z . In this short paper we update the previous results that were based on the Grevesse-Noels solar elemental mix of elements that are lumped into th...
متن کاملBarium and europium abundances in cool dwarf stars and nucleosynthesis of heavy elements
We revise barium abundances in 29 cool stars with metallicities [Fe/H] ranging from −2.20 to 0.07 and europium abundances in 15 stars with [Fe/H] from−1.52 to 0.07. The sample has been extracted from Fuhrmann’s lists (1998, 2000) and confined to main-sequence and turnoff stars with only one subgiant added. The results are based on differential NLTE model atmosphere analyses of spectra that have...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2012
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sts270