Nils Ryde

Is sulphur a typical alpha element?

Is sulphur a typical alpha element?

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.

• Author: Nils Ryde; Henrik Jönsson; Elvijs Matrozis
• Department/s: Lund Observatory - Has been reorganised
• 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