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Like so many things there has been some thought about the prospect you raise and I am sure that I know something about it.
I cant recall but I think the main factor was to have a region of older stars which presumably would give greater opportunity to the prospect of metal being available which I expect really means more elements likely to be present in general as well as what would be no doubt the basic metals considered necessary for a intelligent species with technical abilities commensurate with our expectations of how other life should be...ie like us.
The problem is I expect is that we dont know what we should expect...maybe close in is best as more older stars... I do hope we find others out there...the prospect has my mind racing...will they have the same DNA..will they have wars, will they eat young? Etc.
Alex
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