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
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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3069099
- author
- Bensby, Thomas
LU
and Feltzing, Sofia
LU
- organization
- publishing date
- 2012
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Assembling the Puzzle of the Milky Way
- volume
- 19
- publisher
- EDP Sciences
- conference name
- Conferences of the Assembling the Puzzle of the Milky Way
- conference location
- Le Grand-Bornand, France
- conference dates
- 2011-04-17 - 2011-04-22
- external identifiers
-
- wos:000307668100031
- scopus:84866549807
- ISSN
- 2100-014X
- 2101-6275
- DOI
- 10.1051/epjconf/20121904001
- language
- English
- LU publication?
- yes
- id
- ed1ac831-27b9-4b2c-be2e-c7dc4dcdd643 (old id 3069099)
- date added to LUP
- 2016-04-01 10:46:41
- date last changed
- 2024-01-07 00:50:55
@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 = {{2100-014X}},
language = {{eng}},
publisher = {{EDP Sciences}},
title = {{Chemical constraints on the formation of the Galactic thick disk}},
url = {{https://lup.lub.lu.se/search/files/2120735/3216717.pdf}},
doi = {{10.1051/epjconf/20121904001}},
volume = {{19}},
year = {{2012}},
}