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Table 1:

Open cluster sample.
ID [Fe/H] N [O/Fe] $\sigma$ [Na/Fe] $\sigma$ Ref.
Be 17 -0.10 3 0.13 0.05 0.15 0.08 1
Be 20 -0.45 2 0.34 0.01 0.27 0.10 2
Be 29 -0.54 2 0.39 0.03 0.43 0.01 2
Be 31 -0.56 1 0.40 - 0.34 - 2
Cr 261 -0.03 6 -0.03 0.09 0.33 0.06 3
M 67 0.03 6 -0.07 0.08 -0.02 0.07 4
Mel 66 -0.38 2 0.45 0.02 0.24 0.03 5
Mel 71 -0.30 2 -0.20 0.01 0.2 0.05 6
NGC 2112 -0.10 2 0.0 0.04 0.1 0.02 6
NGC 2141 -0.18 1 0.16 - 0.48 - 2
NGC 2243 -0.48 2 0.18 0.09 0.20 0.07 5
NGC 3680 -0.04 2 0.20 0.05 0.01 0.08 4
NGC 6253 0.46 4 -0.12 0.06 0.21 0.02 7
NGC 6791 0.47 4 -0.25 0.08 0.13 0.21 7
NGC 6939 0.00 9 0.04 0.09 0.32 0.11 8
NGC 7142 0.14 4 0.05 0.03 0.36 0.06 8
NGC 7789 -0.04 9 -0.07 0.09 0.28 0.07 10
Praesepe 0.27 7 -0.40 0.20 -0.04 0.12 4
References: (1) Friel et al. (2005); (2) Yong et al. (2005); (3) Carretta et al. (2005); (4) Pace et al. (2008); (5) Gratton & Contarini (1994); (6) Brown et al. (1996); (7) Carretta et al. (2007b); (8) Jacobson et al. (2007); (9) Jacobson et al. (2008); (10) Tautvaisiene et al. (2005).

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