A Differential Study of the Oxygen Abundances in the Galactic Thin and Thick Disks
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/528563
- author
- Bensby, Thomas LU ; Feltzing, Sofia LU and Lundström, Ingemar LU
- organization
- publishing date
- 2004
- 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>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.}}, 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}}, }