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The Rise of the s-Process in the Galaxy

Simmerer, Jennifer LU ; Sneden, Christopher ; Cowan, John ; Collier, Jason ; Woolf, Vincent and Lawler, James (2004) In The Astrophysical Journal 617(2). p.1091-1114
Abstract
From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3<[Fe/H]<+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by the s-process in the solar system, while Eu owes most of its solar system abundance to the r-process. The changing ratio of these elements in stars over a wide metallicity range traces the changing contributions of these two processes to the Galactic abundance mix. Large s-process abundances can be the result of mass transfer from very evolved stars, so to identify these cases we also report carbon abundances in our metal-poor stars. Results indicate that the s-process may be active as... (More)
From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3<[Fe/H]<+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by the s-process in the solar system, while Eu owes most of its solar system abundance to the r-process. The changing ratio of these elements in stars over a wide metallicity range traces the changing contributions of these two processes to the Galactic abundance mix. Large s-process abundances can be the result of mass transfer from very evolved stars, so to identify these cases we also report carbon abundances in our metal-poor stars. Results indicate that the s-process may be active as early as [Fe/H]=-2.6, although we also find that some stars as metal-rich as [Fe/H]=-1 show no strong indication of s-process enrichment. There is a significant spread in the level of s-process enrichment even at solar metallicity. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Astrophysical Journal
volume
617
issue
2
pages
1091 - 1114
publisher
American Astronomical Society
external identifiers
  • scopus:13944273470
language
English
LU publication?
no
id
3033da09-88ca-48c9-9c82-557e43e24a63 (old id 964926)
date added to LUP
2016-04-04 13:52:39
date last changed
2022-04-24 03:42:53
@article{3033da09-88ca-48c9-9c82-557e43e24a63,
  abstract     = {{From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3&lt;[Fe/H]&lt;+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by the s-process in the solar system, while Eu owes most of its solar system abundance to the r-process. The changing ratio of these elements in stars over a wide metallicity range traces the changing contributions of these two processes to the Galactic abundance mix. Large s-process abundances can be the result of mass transfer from very evolved stars, so to identify these cases we also report carbon abundances in our metal-poor stars. Results indicate that the s-process may be active as early as [Fe/H]=-2.6, although we also find that some stars as metal-rich as [Fe/H]=-1 show no strong indication of s-process enrichment. There is a significant spread in the level of s-process enrichment even at solar metallicity.}},
  author       = {{Simmerer, Jennifer and Sneden, Christopher and Cowan, John and Collier, Jason and Woolf, Vincent and Lawler, James}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{1091--1114}},
  publisher    = {{American Astronomical Society}},
  series       = {{The Astrophysical Journal}},
  title        = {{The Rise of the s-Process in the Galaxy}},
  volume       = {{617}},
  year         = {{2004}},
}