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

@article{citeulike:5291390, abstract = {A sample of 229 nearby thick disk stars has been used to investigate the existence of an age-metallicity relation (AMR) in the Galactic thick disk. The results indicate that that there is indeed an age-metallicity relation present in the thick disk. By dividing the stellar sample into sub-groups, separated by 0.1 dex in metallicity, we show that the median age decreases by about 5-7 Gyr when going from [Fe/H] \&ap; -0.8 to [Fe/H] \&ap; -0.1. Combining our results with our newly published alpha-element trends for a local sample of thick disk stars that show signatures from supernovae type Ia (SN Ia), we draw the conclusion that the time-scale for the peak of the SN Ia rate is of the order of 3-4 Gyr in the thick disk. The tentative evidence for a thick disk AMR that we present here also has implications for the thick disk formation scenario; star-formation must have been an ongoing process for several billion years. This appears to strengthen the hypothesis that the thick disk originated from a merger event with a companion galaxy that puffed up a pre-existing thin disk.<p/> Based on data obtained with the Hipparcos satellite.}, archivePrefix = {arXiv}, author = {{Bensby}, T. and {Feltzing}, S. and {Lundstr{\"{o}}m}, I.}, citeulike-article-id = {5291390}, citeulike-linkout-0 = {http://arxiv.org/abs/astro-ph/0403591}, citeulike-linkout-1 = {http://arxiv.org/pdf/astro-ph/0403591}, citeulike-linkout-2 = {http://dx.doi.org/10.1051/0004-6361:20035957}, citeulike-linkout-3 = {http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004A&amp;A...421..969B}, doi = {10.1051/0004-6361:20035957}, eprint = {astro-ph/0403591}, journal = {Astron. Astrophys.}, keywords = {age\_metallicity, kinematics, solar\_neighborhood}, month = {July}, pages = {969--976}, posted-at = {2009-07-28 15:28:33}, priority = {0}, 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} }

TY - JOUR ID - citeulike:5291390 L3 - citeulike-article-id:5291390 N2 - A sample of 229 nearby thick disk stars has been used to investigate the existence of an age-metallicity relation (AMR) in the Galactic thick disk. The results indicate that that there is indeed an age-metallicity relation present in the thick disk. By dividing the stellar sample into sub-groups, separated by 0.1 dex in metallicity, we show that the median age decreases by about 5-7 Gyr when going from [Fe/H] &ap; -0.8 to [Fe/H] &ap; -0.1. Combining our results with our newly published alpha-element trends for a local sample of thick disk stars that show signatures from supernovae type Ia (SN Ia), we draw the conclusion that the time-scale for the peak of the SN Ia rate is of the order of 3-4 Gyr in the thick disk. The tentative evidence for a thick disk AMR that we present here also has implications for the thick disk formation scenario; star-formation must have been an ongoing process for several billion years. This appears to strengthen the hypothesis that the thick disk originated from a merger event with a companion galaxy that puffed up a pre-existing thin disk.<p/> Based on data obtained with the Hipparcos satellite. JF - Astron. Astrophys. EP - 976 TI - A possible age-metallicity relation in the Galactic thick disk? VL - 421 SP - 969 KW - age_metallicity KW - kinematics KW - solar_neighborhood AU - {Bensby}, T AU - {Feltzing}, S AU - {Lundstr{ö}m}, I PY - 2004/July// UR - http://dx.doi.org/10.1051/0004-6361:20035957 ER -