The Old Halo metallicity gradient:
the trace of a self-enrichment process
Figure 2.
Comparison between 2 theoretical [Fe/H] vs logD
relationships and the metallicity radial distribution function of
the OH+noHBR groups. The plain and dashed curves
represent the self-enrichment model combined with, respectively,
the Murray & Lin (1992) and the Fall & Rees (1985) pressure
profiles. GC symbols are identical
as in Fig. 1