The pure rotation spectrum of the hydroxyl radical and the solar oxygen abundance
Open Access
- 1 July 1983
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 203 (3) , 767-776
- https://doi.org/10.1093/mnras/203.3.767
Abstract
Observations of pure rotation 2Π (0–0) lines of the hydroxyl radical in the solar photospheric spectrum provide a new and independent determination of the solar oxygen abundance. These OH lines with the Holweger–Müller model atmosphere give log ∈(O) = 8.84 which is within 0.08 dex of the abundance provided by the [O I] lines and the same model. It is pointed out that a detection of the CH pure rotation lines would permit a determination of the O/C abundance ratio with a much reduced sensitivity to the model atmosphere uncertainties. Selected combinations of atomic and molecular (not including the OH pure rotation lines) lines give log ∈(O)/∈(C) = 0.23 ± 0.03 dex.Keywords
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