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

Bensby, Thomas LU ; Feltzing, Sofia LU and Lundström, Ingemar LU (2004) In Carnegie Observatories Astrophysics Series, Origin and Evolution of the Elements 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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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
2007-09-13 09:43:51
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2016-04-16 07:36:17
@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},
}