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Table 2

Mean abundances of the two M4 subpopulations (2nd and 3rd column), significance of the abundance difference (4th column), mean abundance of the cluster (5th column), and comparison with literarture.

El. N-poor N-rich Sig. (units of σel) M4(this work) Ma08 Iv99 Yo08

GIRAFFE data
logϵ(Li) +0.97  ±  0.04 +0.97  ±  0.03 0.0 +0.97
 [C/Fe]  –0.20  ±  0.02 –0.36  ±  0.02 5.7 –0.28 –0.50
 [N/Fe]  +0.16  ±  0.03 +0.80  ±  0.02 17.8 +0.48 +0.85
 [O/Fe]  +0.42  ±  0.03 +0.25  ±  0.03 4.0 +0.34 +0.39 +0.25 +0.56
logϵ(C+N+O) 8.18  ±  0.03 8.14  ±  0.02 1.1 8.16 8.24
12C/13C 21.7  ±  0.8 17.4  ±  1.0 3.4 19.6 4.5
 [Na/Fe]  –0.01  ±  0.03 +0.40  ±  0.02 11.4 +0.20 +0.27 +0.22 +0.43
 [Mg/Fe]  +0.46  ±  0.03 +0.48  ±  0.02 0.5 +0.47 +0.50 +0.44 +0.57
 [Al/Fe]  +0.51  ±  0.04 +0.53  ±  0.02 0.4 +0.52 +0.54 +0.64 +0.74
 [Si/Fe]  +0.43  ±  0.02 +0.42  ±  0.02 0.4 +0.43 +0.48 +0.65 +0.58
 [Ca/Fe]  +0.42  ±  0.01 +0.40  ±  0.02 0.9 +0.41 +0.28 +0.26 +0.42
 [Ti/Fe]  +0.35  ±  0.02 +0.31  ±  0.01 1.8 +0.33 +0.32 +0.30 +0.41
 [Cr/Fe]  +0.00  ±  0.02 +0.01  ±  0.03 0.3 +0.01 –0.04 +0.08
 [Fe/H]  –1.14  ±  0.01 –1.14  ±  0.02 0.0 –1.14 –1.07 –1.18 –1.23
 [Ni/Fe]  +0.00  ±  0.01 –0.02  ±  0.01 1.4 –0.01 +0.02 +0.05 +0.12
 [Y/Fe]  +0.10  ±  0.06 +0.31  ±  0.03 3.1 +0.21 +0.69
 [Ba/Fe]  +0.29  ±  0.02 +0.32  ±  0.01 1.3 +0.31 +0.41 +0.60
 [Eu/Fe]  +0.20  ±  0.03 +0.20  ±  0.03 0.0 +0.20 +0.35 +0.40

UVES data
 [Na/Fe]  +0.07  ±  0.03 +0.42  ±  0.02 9.7 +0.25 +0.27 +0.22 +0.43
 [Y/Fe]  +0.19  ±  0.03 +0.33  ±  0.02 3.9 +0.26 +0.69
 [Zr/Fe]  +0.44  ±  0.02 +0.47  ±  0.03 0.8 +0.46 +0.23

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