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A possible age-metallicity relation in the Galactic thick disk?

Bensby, Thomas LU orcid ; Feltzing, Sofia LU orcid and Lundström, Ingemar LU (2004) In Astronomy and Astrophysics 421. p.969-976
Abstract
A sample of 229 nearby thick disk stars has been used to investigate theexistence of an age-metallicity relation (AMR) in the Galactic thickdisk. The results indicate that that there is indeed an age-metallicityrelation present in the thick disk. By dividing the stellar sample intosub-groups, separated by 0.1 dex in metallicity, we show that the medianage decreases by about 5-7 Gyr when going from [Fe/H] ≈ -0.8 to[Fe/H] ≈ -0.1. Combining our results with our newly publishedα-element trends for a local sample of thick disk stars that showsignatures from supernovae type Ia (SN Ia), we draw the conclusion thatthe time-scale for the peak of the SN Ia rate is of the order of 3-4 Gyrin the thick disk. The tentative evidence for a thick disk AMR... (More)
A sample of 229 nearby thick disk stars has been used to investigate theexistence of an age-metallicity relation (AMR) in the Galactic thickdisk. The results indicate that that there is indeed an age-metallicityrelation present in the thick disk. By dividing the stellar sample intosub-groups, separated by 0.1 dex in metallicity, we show that the medianage decreases by about 5-7 Gyr when going from [Fe/H] ≈ -0.8 to[Fe/H] ≈ -0.1. Combining our results with our newly publishedα-element trends for a local sample of thick disk stars that showsignatures from supernovae type Ia (SN Ia), we draw the conclusion thatthe time-scale for the peak of the SN Ia rate is of the order of 3-4 Gyrin the thick disk. The tentative evidence for a thick disk AMR that wepresent here also has implications for the thick disk formationscenario; star-formation must have been an ongoing process for severalbillion years. This appears to strengthen the hypothesis that the thickdisk originated from a merger event with a companion galaxy that puffedup a pre-existing thin disk.Based on data obtained with the Hipparcos satellite. (Less)
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publication status
published
subject
keywords
stars: Hertzsprung-Russell (HR) and C-M diagrams, stars: kinematics, Galaxy: disk, Galaxy: formation, Galaxy: solar neighbourhood, Galaxy: kinematics and dynamics
in
Astronomy and Astrophysics
volume
421
pages
969 - 976
publisher
EDP Sciences
external identifiers
  • wos:000223249700017
  • scopus:3142680399
ISSN
1432-0746
DOI
10.1051/0004-6361:20035957
language
English
LU publication?
yes
id
2c0409d9-99b5-4765-8541-1abcdfc0cee9 (old id 134119)
date added to LUP
2016-04-01 16:32:51
date last changed
2024-01-11 09:01:13
@article{2c0409d9-99b5-4765-8541-1abcdfc0cee9,
  abstract     = {{A sample of 229 nearby thick disk stars has been used to investigate theexistence of an age-metallicity relation (AMR) in the Galactic thickdisk. The results indicate that that there is indeed an age-metallicityrelation present in the thick disk. By dividing the stellar sample intosub-groups, separated by 0.1 dex in metallicity, we show that the medianage decreases by about 5-7 Gyr when going from [Fe/H] ≈ -0.8 to[Fe/H] ≈ -0.1. Combining our results with our newly publishedα-element trends for a local sample of thick disk stars that showsignatures from supernovae type Ia (SN Ia), we draw the conclusion thatthe time-scale for the peak of the SN Ia rate is of the order of 3-4 Gyrin the thick disk. The tentative evidence for a thick disk AMR that wepresent here also has implications for the thick disk formationscenario; star-formation must have been an ongoing process for severalbillion years. This appears to strengthen the hypothesis that the thickdisk originated from a merger event with a companion galaxy that puffedup a pre-existing thin disk.Based on data obtained with the Hipparcos satellite.}},
  author       = {{Bensby, Thomas and Feltzing, Sofia and Lundström, Ingemar}},
  issn         = {{1432-0746}},
  keywords     = {{stars: Hertzsprung-Russell (HR) and C-M diagrams; stars: kinematics; Galaxy: disk; Galaxy: formation; Galaxy: solar neighbourhood; Galaxy: kinematics and dynamics}},
  language     = {{eng}},
  pages        = {{969--976}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{A possible age-metallicity relation in the Galactic thick disk?}},
  url          = {{https://lup.lub.lu.se/search/files/4704775/624411.pdf}},
  doi          = {{10.1051/0004-6361:20035957}},
  volume       = {{421}},
  year         = {{2004}},
}