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Nils Ryde. Photo.

Nils Ryde

Professor

Nils Ryde. Photo.

Is sulphur a typical alpha element?

Is sulphur a typical alpha element?

Author

  • Nils Ryde
  • Henrik Jönsson
  • Elvijs Matrozis

Summary, in English

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.

Department/s

  • Lund Observatory

Publishing year

2014-01-01

Language

English

Pages

269-271

Publication/Series

Memorie della Societa Astronomica Italiana

Volume

85

Issue

269

Document type

Journal article

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Stars: abundances
  • Stars: atmospheres
  • Stars: Population II
  • Infrared: stars

Status

Published