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

Thomas Bensby, Sofia Feltzing, Ingemar Lundström

    Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceedingPeer review

    Sammanfattning

    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.
    Originalspråkengelska
    Titel på värdpublikationCarnegie Observatories Astrophysics Series, Origin and Evolution of the Elements
    FörlagCarnegie Observatories
    Volym4
    StatusPublished - 2004

    Publikationsserier

    Namn
    Volym4

    Ämnesklassifikation (UKÄ)

    • Astronomi, astrofysik och kosmologi

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