Oxygen Abundances in Metal-Rich Halo Stars

Details Oxygen Abundances in Metal-Rich Halo Stars Oxygen Abundances in Metal-Rich Halo Stars

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1302l&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #13.02; Bulletin of the American Astronomical Society, Vol. 29, p.1229

Astronomy and Astrophysics

Astronomy

Scientific paper

We present oxygen abundances for a sample of eight field dwarf stars with -0.9 < [Fe/H] < -0.5, which are more metal-rich than the traditional halo-disk boundary but have kinematics typical of metal-poor halo stars. The observed [O/Fe] abundances show a scatter which is larger than the expected observational errors. Consideration of these and published O/Fe determinations indicates a substantial range of [O/Fe] in the range -1.2 < [Fe/H] < -0.5, with no clear correlation with kinematics. If the O/Fe ratio is indicative of the chemical evolution time scale, these data suggest that no single time scale is sufficient to characterize the evolution of the metal-rich halo or the metal-poor disk, nor is there a clear boundary in time between the two.

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