Metal-rich end of galactic chemical evolution: oxygen abundances from [OI] 6300, OI 7771 5 and near-UV OH.

Bibcode
2005IAUS..228..253E
DOI
10.1017/S1743921305005697
Ecuvillon, A.; Israelian, G.; Santos, N. C.; Shchukina, N. G.; Mayor, M.; Rebolo, R.
Bibliographical reference

From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium Proceedings of the international Astronomical Union 228, Held in Paris, France, May 23-27, 2005. edited by Hill, V.; François, P.; Primas, F. Cambridge: Cambridge University Press, 2005., pp.253-254

Advertised on:
0
2005
Number of authors
6
IAC number of authors
0
Citations
0
Refereed citations
0
Description
We present a detailed and uniform study of oxygen abundances in a large set of 155 metal-rich dwarfs. EW measurements were carried out for the [OI] 6300 Å line and the OI triplet, while spectral synthesis was performed for several OH lines. NLTE corrections were calculated and applied to the LTE abundance results derived from the triplet. Abundances from [OI], the OI triplet and near-UV OH were obtained in 103, 87 and 77 dwarfs, respectively. A good agreement between [O/H] ratios from forbidden and OH lines is found, while the NLTE triplet shows a systematically lower abundance. Nevertheless, the consistency with other indicators improves if we consider LTE triplet results. In any case, discrepancies between OH, [OI] and the OI triplet hardly exceed 0.2dex. All three indicators show that, on average, [O/Fe] decreases with [Fe/H] in the metallicity range -0.8<[Fe/H]<0.5.
Type
Non-refereed

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