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Fig. 7.

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Fitting of the OH band at 1.5 and 1.6 μm in HD 218330. The observed spectrum is shown in black, and the synthetic spectra of different oxygen abundances are shown in blue ([O/Fe] = 0.2 dex), orange ([O/Fe] = 0.4 dex), and green ([O/Fe] = 0.6 dex). The vertical dashed black line shows the OH lines considered for the abundance analysis. The best-fit line is shown in orange with O = 0.40 dex.

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