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Fig. 5

image

Abundances of Na, Mg, and K (left) and abundance-abundance ratios (right) plotted versus the distance from the cluster center, r/rh (small filled circles; rh is a half-mass radius of 47 Tuc, rh = 174′′, taken from Trager et al. 1993). Symbol color denotes quality (class) of the spectral lines from which the abundance was determined (see Fig. 4). Large open circles are average abundances/abundance ratios computed in non-overlapping Δr/rh = 1 wide distance bins (marked by the vertical dashed lines; note that the outermost bin is wider; error bars measure the RMS scatter of abundances/abundance ratios in a given bin). Black solid lines are linear fits to the data of individual stars, with the p-values (see text) marked in the corresponding panels.

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