A possible age-metallicity relation in the Galactic thick disk?
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/134119
- author
- Bensby, Thomas LU ; Feltzing, Sofia LU and Lundström, Ingemar LU
- organization
- publishing date
- 2004
- type
- Contribution to journal
- 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}}, }