The Old Halo metallicity gradient: the trace of a self-enrichment process:
Table 2.
Metallicity vs log
D
for the OH+noHGR groups
[Fe/H]
log
D
n
-1.2 
[Fe/H] < -0.8
-1.6 
[Fe/H] < -1.2
-2.0 
[Fe/H] < -1.6
-2.4 
[Fe/H] < -2.0
0.41
0.64
0.89
1.02
13
28
25
9
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