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A Differential Study of the Oxygen Abundances in the Galactic Thin and Thick Disks

Bensby, Thomas LU orcid ; Feltzing, Sofia LU orcid and Lundström, Ingemar LU (2004) 4.
Abstract
First results from a study into the abundance trends of oxygen in the Galactic thin and thick disks are presented. Oxygen abundances for 63nearby F and G dwarf stars, based on very high resolution spectra (R∼215 000) and high signal-to-noise (S/N>400) of the faint forbidden oxygen line at 6300Å, have been determined. Our findings can be summarized as follows: 1) at [Fe/H]<0 the oxygen trends in thethin and thick disk are smooth and distinct, indicating their different origins, 2) [O/Fe] for the thick disk stars show a turn-over at[Fe/H]∼-0.35, indicating the peak of the enrichment from SNe type Ia to the interstellar medium, 3) the thin disk stars show a shallow decrease going from [Fe/H] ∼-0.7 to the highest metallicities with no... (More)
First results from a study into the abundance trends of oxygen in the Galactic thin and thick disks are presented. Oxygen abundances for 63nearby F and G dwarf stars, based on very high resolution spectra (R∼215 000) and high signal-to-noise (S/N>400) of the faint forbidden oxygen line at 6300Å, have been determined. Our findings can be summarized as follows: 1) at [Fe/H]<0 the oxygen trends in thethin and thick disk are smooth and distinct, indicating their different origins, 2) [O/Fe] for the thick disk stars show a turn-over at[Fe/H]∼-0.35, indicating the peak of the enrichment from SNe type Ia to the interstellar medium, 3) the thin disk stars show a shallow decrease going from [Fe/H] ∼-0.7 to the highest metallicities with no apparent turn-over present indicating a more quiet star formation history, and 4) [O/Fe] continues to decrease at [Fe/H] > 0 without showing the leveling out that previously has been seen. (Less)
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author
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Carnegie Observatories Astrophysics Series, Origin and Evolution of the Elements
volume
4
publisher
Carnegie Observatories
language
English
LU publication?
yes
id
2a182176-8eea-4386-8c47-dc821c6a895f (old id 528563)
date added to LUP
2016-04-04 10:12:20
date last changed
2018-11-21 20:57:26
@inproceedings{2a182176-8eea-4386-8c47-dc821c6a895f,
  abstract     = {{First results from a study into the abundance trends of oxygen in the Galactic thin and thick disks are presented. Oxygen abundances for 63nearby F and G dwarf stars, based on very high resolution spectra (R∼215 000) and high signal-to-noise (S/N&gt;400) of the faint forbidden oxygen line at 6300Å, have been determined. Our findings can be summarized as follows: 1) at [Fe/H]&lt;0 the oxygen trends in thethin and thick disk are smooth and distinct, indicating their different origins, 2) [O/Fe] for the thick disk stars show a turn-over at[Fe/H]∼-0.35, indicating the peak of the enrichment from SNe type Ia to the interstellar medium, 3) the thin disk stars show a shallow decrease going from [Fe/H] ∼-0.7 to the highest metallicities with no apparent turn-over present indicating a more quiet star formation history, and 4) [O/Fe] continues to decrease at [Fe/H] &gt; 0 without showing the leveling out that previously has been seen.}},
  author       = {{Bensby, Thomas and Feltzing, Sofia and Lundström, Ingemar}},
  booktitle    = {{Carnegie Observatories Astrophysics Series, Origin and Evolution of the Elements}},
  language     = {{eng}},
  publisher    = {{Carnegie Observatories}},
  title        = {{A Differential Study of the Oxygen Abundances in the Galactic Thin and Thick Disks}},
  volume       = {{4}},
  year         = {{2004}},
}