Oxygen abundances derived from the O I triplet and [O I]6300 as a function of two activity indices derived from the Ca II H+K lines and the X-ray luminosity. This illustrates the correlation between the oxygen abundances and the stellar activity level. The bottom panels show the difference between [O/Fe] given by the 2 indicators. The sample is made up of RS CVn binaries, field subgiants, open cluster stars and disk dwarfs.