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Table 7

Stellar abundances determined for Si , Mg , C , N and O .

ID ρ/ρo ϵSi a ϵC a ϵN a ϵO a ϵMg a [Z /Z ]

 ⊙  7.51 8.43 7.83 8.69 7.60

A_8 0.64 7.18 7.27 7.33 8.28  −0.37
C1_44 0.22 7.08 7.71 7.56 8.07  −0.53
C1_9  −0.11 6.80 7.23 7.95 8.66 6.80  −0.51
C1_13  −0.06 7.07 7.60 7.63 8.45 6.92  −0.45
C1_45 0.22 7.13 8.07 8.17 8.34 7.00  −0.44
A_17 0.75 7.06 7.77 7.64 8.37 7.02  −0.45
D_27  −0.32 7.01 7.37 8.28 8.26 7.27  −0.42
A_27 0.80 7.04 7.77 8.52 8.07 6.98  −0.57
C1_53 0.28 7.25 7.52 8.22 8.63 7.28  −0.21
B_31 0.50 7.10 7.22 8.25 8.59 7.26  −0.28
A_26 0.78 7.43 7.48 8.22 8.60 7.33  −0.15
A_11 0.68 7.17 7.20  −0.37

Notes. The projected radial distance of the stars to the optical center of NGC 55 normalized by the major semi-axis (ρo ~ 16′) is displayed as well (ρ / ρo). Negative values of ρ / ρo mean that these stars are located westward of the galactic center. The solar abundances used as a references ( ⊙ ) were taken from Asplund et al. (2009).

(a)

ϵX  = log  (X  / H ) + 12 (by number).

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