Table 3: Average abundances a of F and G stars with solar metallicity ( $\left\vert\Delta\rm[Fe/H]\right\vert<0.05$) and of young stars (age $\le $1 Gyr) from the solar neighbourhood. $\sigma _{\rm abd}$ is the accuracy of the abundance determinations from stellar spectra, $\sigma _{*}$ is the scattering of the stellar abundances around the mean. Z is the metallicity calculated from these abundances.
      Nearby F & G stars B dwarfs
      solar met. age <1 Gyr        
Z Element a $\sigma _{\rm abd}$ $\sigma _{*}$ a $\sigma _{*}$ Source a $\sigma _{*}$ Source
2   He             11.02 0.05 3
6   C 8.37 0.06 0.11 8.39 0.11 2 8.32 0.10 4
7   N             7.73 0.28 5
8   O 8.75   0.07 8.77 0.13 1 8.63 0.18 4
10   Ne             8.11 0.04 6
11   Na 6.30 0.03 0.16 6.27 0.10 1      
12   Mg 7.63 0.06 0.32 7.64 0.21 1 7.59 0.15 7
13   Al 6.52 0.05 0.24 6.54 0.22 1 6.24 0.14 5
14   Si 7.60 0.05 0.28 7.61 0.23 1 7.50 0.21 5
16   S 7.17 0.16   7.29 0.10   7.22 0.10 4
18   Ar             6.48 0.04 8
20   Ca 6.42 0.03 0.37 6.48 0.39 1      
22   Ti 4.92 0.03 0.11 4.94 0.14 1      
24   Cr 5.66 0.02 0.13 5.73 0.28 1      
26   Fe 7.55 0.06 0.12 7.61 0.25 1 7.46 0.08 9
28   Ni 6.22 0.02 0.09 6.25 0.07 1      
30   Zn 4.53 0.06 0.27 4.54 0.13 1      
    Z 0.0194     0.0203     0.168    
Sources: (1) Bensby et al. (2005), (2) Bensby & Feltzing (2006), (3) Lyubimkov et al. (2004), (4) Daflon & Cunha (2004), (5) Rolleston et al. (2000), (6) Cunha et al. (2006), (7) Lyubimkov et al. (2005), (8) Holmgren et al. (1990), (9) Cunha & Lambert (1994).

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