Oxygen abundances of halo dwarf and subgiant stars from VLT/UVES observations of the [Oi] λ6300 line

Astronomy and Astrophysics – Astronomy

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Scientific paper

The forbidden oxygen line at 6300 Å has been observed with UVES on the ESO VLT for 13 dwarf and subgiant stars ranging in metallicity from [Fe/H]~=-0.7 to -1.8. The spectra obtained have a resolution of /R=55000 and /S/N~=400. After removal of telluric lines, the equivalent width of the [Oi] line could be measured with an accuracy of 0.2 to 0.3 mÅ. Using these data and the equivalent widths of eight weak Feii lines, the trend of [O/Fe] with [Fe/H] has been derived. Below [Fe/H]~=-1.0 the oxygen-to-iron ratio is nearly constant at a level of [O/Fe]~=0.4 in contradiction to recent results from UV OH lines.

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