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Is sulphur a typical alpha element?

Ryde, Nils LU ; Jönsson, Henrik LU and Matrozis, Elvijs (2014) In Memorie della Societa Astronomica Italiana 85(269). p.269-271
Abstract (Swedish)
Observationally, the galactic chemical evolution of sulphur shows a complex pattern. Some studies find no correlation between [S/Fe] and [Fe/H] at halo metallcities, which is typical for alpha -elements, others find [S/Fe] increasing towards lower metallicities, and still others find a combination of the two. Each scenario has different implications for the Galactic chemical evolution of sulphur. Here, we briefly summarise our results \citep{henrik:11,matrozis:13} from investigations where we derive stellar sulphur abundances from the [SI] lambda1082 nm line, a atomic transition which hardly shows any departures from local thermodynamic equilibrium, or LTE. Our results argue for a chemical evolution of sulphur that is typical for alpha... (More)
Observationally, the galactic chemical evolution of sulphur shows a complex pattern. Some studies find no correlation between [S/Fe] and [Fe/H] at halo metallcities, which is typical for alpha -elements, others find [S/Fe] increasing towards lower metallicities, and still others find a combination of the two. Each scenario has different implications for the Galactic chemical evolution of sulphur. Here, we briefly summarise our results \citep{henrik:11,matrozis:13} from investigations where we derive stellar sulphur abundances from the [SI] lambda1082 nm line, a atomic transition which hardly shows any departures from local thermodynamic equilibrium, or LTE. Our results argue for a chemical evolution of sulphur that is typical for alpha -elements, contrary to some previous studies that have found high sulphur abundances ([S/Fe]gtrsim0 .6) for stars with -2.5<[Fe/H]<-1. (Less)
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Is sulphur a typical alpha element?
publishing date
type
Contribution to journal
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published
subject
keywords
Stars: abundances, Stars: atmospheres, Stars: Population II, Infrared: stars
in
Memorie della Societa Astronomica Italiana
volume
85
issue
269
pages
3 pages
language
English
LU publication?
yes
id
20a0d39d-990f-4930-b546-61e04895b75d
date added to LUP
2016-09-14 10:00:24
date last changed
2016-09-20 18:04:47
@misc{20a0d39d-990f-4930-b546-61e04895b75d,
  abstract     = {Observationally, the galactic chemical evolution of sulphur shows a complex pattern. Some studies find no correlation between [S/Fe] and [Fe/H] at halo metallcities, which is typical for alpha -elements, others find [S/Fe] increasing towards lower metallicities, and still others find a combination of the two. Each scenario has different implications for the Galactic chemical evolution of sulphur. Here, we briefly summarise our results \citep{henrik:11,matrozis:13} from investigations where we derive stellar sulphur abundances from the [SI] lambda1082 nm line, a atomic transition which hardly shows any departures from local thermodynamic equilibrium, or LTE. Our results argue for a chemical evolution of sulphur that is typical for alpha -elements, contrary to some previous studies that have found high sulphur abundances ([S/Fe]gtrsim0 .6) for stars with -2.5&lt;[Fe/H]&lt;-1.},
  author       = {Ryde, Nils and Jönsson, Henrik and Matrozis, Elvijs},
  keyword      = {Stars: abundances,Stars: atmospheres,Stars: Population II,Infrared: stars},
  language     = {eng},
  month        = {01},
  number       = {269},
  pages        = {269--271},
  series       = {Memorie della Societa Astronomica Italiana},
  title        = {Is sulphur a typical alpha element?},
  volume       = {85},
  year         = {2014},
}