The isotopic mixture of barium in the metal-poor subgiant HD 140283
Abstract
Analyses of the abundances of neutron-capture elements have led to the belief that these elements in metal-poor stars are r-process products with relative abundances closely resembling those found in the Solar system. This picture was challenged by Magain, who found that a pure r-process mix of the barium isotopes was inconsistent with the mix of odd to even barium isotopes derived from analysis of the BaII line at 4554 Å in the spectrum of the metal-poor subgiant HD 140283. In this paper, we address Magain's challenge using new high-resolution high signal-to-noise spectra of HD 140283, and find, in contrast to his result, that a solar-like r-process isotopic mixture provides a fair fit to the observed 4554-Å profile.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 2002
- DOI:
- 10.1046/j.1365-8711.2002.05643.x
- arXiv:
- arXiv:astro-ph/0205376
- Bibcode:
- 2002MNRAS.335..325L
- Keywords:
-
- stars: abundances;
- stars: individual: HD 140283;
- Astrophysics
- E-Print:
- 11 pages, 6 figures