Oxygen abundances of halo stars from UVES observations of the λ6300 [OI] line
Abstract
The forbidden oxygen line at 6300 Å has been observed with UVES at the ESO VLT for 15 turnoff and subgiant stars ranging in metallicity from [Fe/H] = -0.7 to -1.8. The spectra obtained have a resolution of R = 55.000 and S/N > 400 with 6 pixels per spectral resolution bin. After removal of telluric O2 lines by the aid of B-type calibration spectra, the equivalent width of the [OI] line could be measured to a precision of 0.2 to 0.3 m Å . Using these data and the eqivalent widths of 8 weak FeII lines, the trend of [O/Fe] with [Fe/H] has been derived and is compared with recent results from the UV OH lines and the OI triplet at 7774 Å .
- Publication:
-
IAU Joint Discussion
- Pub Date:
- 2000
- Bibcode:
- 2000IAUJD...8E..21N