We have analysed high-dispersion Echelle spectra (R=60000) of red giant members of five open clusters to derive abundances for many elements from Na to Eu. The [Fe/H] values are -0.06+/-0.03 for Stock 2, -0.11+/-0.03 for NGC 2168, -0.01+/-0.03 for NGC 6475, 0.00+/-0.03 for NGC 6991, and -0.07+/-0.03 for NGC 7662. Sodium is enriched in the giants relative to the abundance expected of main-sequence stars of the same metallicity. This enrichment of [Na/Fe] by about +0.25 attributed to the first dredge-up is discussed in the light of theoretical predictions and recently published abundance determinations. Abundance ratios [El/Fe] for other elements are with very few exceptions equal to those of field giants and dwarfs, i.e. [El/Fe]~0.00 for [Fe/H]~0.0. An exception is the overabundance of La, Ce, Nd, and Sm in NGC 6991 but this is consistent with our previous demonstration that the abundances of these s-process products vary by about +/-0.2 among clusters of the same [Fe/H], a variation found also among field giants and dwarfs.

Cone search capability for table J/MNRAS/485/3623/table1 (The journal of the observations for the cluster members)

Cone search capability for table J/MNRAS/485/3623/table10 (Mean LTE and non-LTE abundances of Na and Al in OCs analysed in this paper and in Reddy et al. (2012MNRAS.419.1350R, Cat. J/MNRAS/419/1350, 2013MNRAS.431.3338R, Cat. J/MNRAS/431/3338, 2015MNRAS.450.4301R, Cat. J/MNRAS/450/4301, 2016MNRAS.463.4366R))