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Article Dans Une Revue Astronomy Reports Année : 2007

Abundances of neutron-capture elements in atmospheres of cool giants

Résumé

We have determined the atmospheric abundances of Y, Ba, La, Ce, Pr, Nd, and Eu for a sample of 171 giants selected as clump giants with metallicities [Fe/H] between ?0.7 and 0.3 dex, based on photometric criteria. In our analysis, we assumed local thermodynamic equilibrium and fit the parameters of model atmospheres to high-resolution (R = 42 000) echelle spectra with high signal-to-noise ratios. The Ba and Eu abundances were derived using synthetic spectra, including hyperfine structure. We find no significant difference in the abundances of s-or r-process neutron-capture elements between clump giants and ascending-branch giants selected by us earlier. We also analyze the relation between the abundances of neutron-capture elements and [Fe/H].

Dates et versions

hal-00155477 , version 1 (18-06-2007)

Identifiants

Citer

O. Bienaymé, T. I. Gorbaneva, V. V. Kovtyukh, T. V. Mishenina, C. Soubiran, et al.. Abundances of neutron-capture elements in atmospheres of cool giants. Astronomy Reports, 2007, 51 (5), pp.382-393. ⟨10.1134/S1063772907050046⟩. ⟨hal-00155477⟩
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