Can I read Thorium-rich halo star HD221170: further evidence against the universality of the r-process on EtoBox?

Thorium-rich halo star HD221170: further evidence against the universality of the r-process by Yushchenko, Alexander; Gopka, Vera; Goriely, Stephane; Musaev, Faig; Shavrina, Angelina; Kim, Chulhee; Kang, Young Woon; Kuznietsova, Juliana; Yushchenko, Vladimir is a scholarly article available to read on EtoBox.

What is Thorium-rich halo star HD221170: further evidence against the universality of the r-process about?

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 \AA. 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.

Author

Yushchenko, Alexander; Gopka, Vera; Goriely, Stephane; Musaev, Faig; Shavrina, Angelina; Kim, Chulhee; Kang, Young Woon; Kuznietsova, Juliana; Yushchenko, Vladimir

Published

2004

Language

EN