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Thomas Bensby. Profile photo.

Thomas Bensby

Senior lecturer

Thomas Bensby. Profile photo.

Chemical constraints on the formation of the Galactic thick disk


  • Thomas Bensby
  • Sofia Feltzing

Summary, in English

We highlight some results from our detailed abundance analysis study of 703 kinematically selected F and G dwarf stars in the solar neighbourhood. The analysis is based on spectra of high-resolution (R = 45 000 to 110 000) and high signal-to-noise (S/N approximate to 150 to 300). The main findings include: (1) at a given metallicity, the thick disk abundance trends are more alpha-enhanced than those of the thin disk; (2) the metal-rich limit of the thick disk reaches at least solar metallicities; (3) the metal-poor limit of the thin disk is around [Fe/H] approximate to -0.8; (4) the thick disk shows an age-metallicity gradient; (5) the thin disk does not show an age-metallicity gradient; (6) the most metal-rich thick disk stars at [Fe/H] approximate to 0 are significantly older than the most metal-poor thin disk stars at [Fe/H] approximate to -0.7; (7) based on our elemental abundances we find that kinematical criteria produce thin and thick disk stellar samples that are biased in the sense that stars from the low-velocity tail of the thick disk are classified as thin disk stars, and stars from the high-velocity tail of the thin disk are classified as thick disk stars; (8) age criteria appears to produce thin and thick disk stellar samples with less contamination.


  • Lund Observatory - Has been reorganised

Publishing year





Assembling the Puzzle of the Milky Way



Document type

Conference paper


EDP Sciences


  • Astronomy, Astrophysics and Cosmology

Conference name

Conferences of the Assembling the Puzzle of the Milky Way

Conference date

2011-04-17 - 2011-04-22

Conference place

Le Grand-Bornand, France




  • ISSN: 2100-014X
  • ISSN: 2101-6275