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Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm
- Source :
- Chinese Physics Letters. 24:1417-1420
- Publication Year :
- 2007
- Publisher :
- IOP Publishing, 2007.
-
Abstract
- The star HE 1305-0007 is a metal-poor double-enhanced star with metallicity [Fe/H] $=-2.0$, which is just at the upper limit of the metallicity for the observed double-enhanced stars. Using a parametric model, we find that almost all s-elements were made in a single neutron exposure. This star should be a member of a post-common-envelope binary. After the s-process material has experienced only one neutron exposure in the nucleosynthesis region and is dredged-up to its envelope, the AGB evolution is terminated by the onset of common-envelope evolution. Based on the high radial-velocity of HE 1305-0007, we speculate that the star could be a runaway star from a binary system, in which the AIC event has occurred and produced the r-process elements.<br />Comment: 4 pages, 3 figures, paper accepted for publication in Chinese Physics letters
Details
- ISSN :
- 17413540 and 0256307X
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Chinese Physics Letters
- Accession number :
- edsair.doi.dedup.....821a74830d008702650b8e2f8f259eb9