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Chemical constraints on the formation of the Galactic thick disk

Bensby, Thomas LU and Feltzing, Sofia LU (2012) Conferences of the Assembling the Puzzle of the Milky Way In Assembling the Puzzle of the Milky Way 19.
Abstract
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]... (More)
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. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Assembling the Puzzle of the Milky Way
volume
19
publisher
EDP Sciences
conference name
Conferences of the Assembling the Puzzle of the Milky Way
external identifiers
  • wos:000307668100031
  • scopus:84866549807
ISSN
2101-6275
2100-014X
DOI
10.1051/epjconf/20121904001
language
English
LU publication?
yes
id
ed1ac831-27b9-4b2c-be2e-c7dc4dcdd643 (old id 3069099)
date added to LUP
2012-09-26 15:34:27
date last changed
2017-04-16 03:16:55
@inproceedings{ed1ac831-27b9-4b2c-be2e-c7dc4dcdd643,
  abstract     = {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.},
  author       = {Bensby, Thomas and Feltzing, Sofia},
  booktitle    = {Assembling the Puzzle of the Milky Way},
  issn         = {2101-6275},
  language     = {eng},
  publisher    = {EDP Sciences},
  title        = {Chemical constraints on the formation of the Galactic thick disk},
  url          = {http://dx.doi.org/10.1051/epjconf/20121904001},
  volume       = {19},
  year         = {2012},
}