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    Abundances Of Light Elements In Metal-Poor Stars IV. Fe/O And Fe/Mg Ratios And The History Of Star Formation In The Solar Neighborhood

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    abundanceslightelementsmetalpoorstars.pdf (287.9Kb)
    Date
    2000-06
    Author
    Gratton, Raffaele Gratton
    Carretta, Eugenio
    Matteucci, Francesca
    Sneden, Christopher
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    Abstract
    The accurate O, Mg and Fe abundances derived in previous papers of this series from a homogeneous reanalysis of high quality data for a large sample of stars are combined with stellar kinematics in order to discuss the history of star formation in the solar neighborhood. We found that the Fe/O and Fe/Mg abundance ratios are roughly constant in the (inner) halo and the thick disk; this means that the timescale of halo collapse was shorter than or of the same order of typical lifetime of progenitors of type Ia SNe (similar to 1 Gyr), this conclusion being somewhat relaxed (referring to star formation in the individual fragments) in an accretion model for the Galaxy formation. Both Fe/O and Fe/Mg ratios raised by similar to 0.2 dex while the O/H and Mg/H ratios hold constant during the transition from the thick to thin disk phases, indicating a sudden decrease in star formation in the solar neighbourhood at that epo;ch. These results are discussed in the framework of current views of Galaxy formation; they fit in a scenario where both dissipational collapse and accretions were active on a quite similar timescale.
    Department
    Astronomy
    Subject
    stars : abundances
    nuclear reactions, nucleosynthesis, abundances
    galaxy : evolution
    ccd surface photometry
    stellar oxygen abundances
    on spiral galaxies
    galactic disks
    globular-clusters
    chemical evolution
    sinking
    satellites
    field stars
    halo field
    metallicity
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34537
    Citation
    Gratton, Raffaele, Eugenio Carretta, Francesca Matteucci, and Christopher Sneden. >Abundances of light elements in metal-poor stars. IV.[Fe/O] and [Fe/Mg] and the history of star formation in the solar neighborhood.> Astronomy & Astrophysics, (Jun., 2000).
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