Oxygen abundances from infrared OH lines

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Oxygen abundances are derived from the vibrational-rotational OH lines in the infrared. The flat trend of [O/Fe] between -2.5<[Fe/H]<-1.5 from the infrared lines is in sharp disagreement with published results from the electronic transitions of OH in the ultraviolet. However, we note that a careful comparison of IR-OH, [OI] and UV-OH lines in the subgiant BD +23 3130 yields excellent consistency in the oxygen abundance. The agreement between the IR-OH and [OI] trends, and the consistency of these results with Galactic chemical model predictions suggest that the low oxygen values represent the preferred trend.

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