Thorium-rich halo star HD221170: further evidence against the universality of the r-process

Abstract

We report the abundance determination in the atmosphere of the bright halo star HD221170. The spectra were taken with the Terskol Observatory's 2.0-m telescope with a resolution R=45000 and signal-to-noise ratio up to 250 in the wavelength region 3638-10275 Å. The adopted atmospheric parameters correspond to an effective temperature \Tef=4475 K, a surface gravity \lgg=1.0, a microturbulent velocity \vmi=1.7 \kms, and a macroturbulent velocity \vma=4 \kms. The abundances of 43 chemical elements were determined with the method of spectrum synthesis. The large overabundances (by 1 dex relative to iron) of elements with Z$>38$ are shown to follow the same pattern as the solar r-abundances. The present HD221170 analysis confirms the non-universality of the r-process, or more exactly the observation that the astrophysical sites hosting the r-process do not always lead to a unique relative abundance distribution for the bulk Ba to Hg elements, the Pb-peak elements, and the actinides.

arXiv comment8 pages, 8 figures, A&A accepted for publ

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• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
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• Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars
• r-Process Calculations and Galactic Chemical Evolution
• The first determination of the actinide Th abundance for a red giant of the Ursa Minor dwarf galaxy
• Neutron-capture elements in the metal-poor globular cluster M15
• Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions
• The Hamburg/ESO R-process Enhanced Star survey (HERES)VII. Thorium abundances in metal-poor stars
• Astrophysics in 2005