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:
http://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
- 2007-07-12 14:05:07
- date last changed
- 2018-01-07 09:21:31
@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}, keyword = {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 = {http://dx.doi.org/10.1051/0004-6361:20035957}, volume = {421}, year = {2004}, }