Spatial distribution of chemical species in NGC 55. The plots in the left column display the abundance of Si , Mg , O and Z with respect to solar values (Asplund et al. 2009) against projected galactocentric distance (ρ / ρo). The mean value is indicated with a dotted black line and the linear regression with a red dashed line. The linear regressions do not show any clear abundance pattern with almost null slopes (see Table 9). For oxygen, we also show the H ii regions oxygen abundances (blue dots) derived by Webster & Smith (1983) based on the application of strong-line methods. New estimation of O abundances, obtained in this work, based on the auroral line [O iii] 4363 Å measured by Webster & Smith (1983) (green stars, see text for additional details). The plots in the right column show the 2D distribution maps, following the color-code shown in the top-right plot.
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