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HE1327-2326, discovered in 2005, is the star with the lowest known iron abundance to date. The star is a member of Population II, with an iron to hydrogen ratio (Fe/H), or metallicity, of -5.6. This number indicates that its iron content is 300,000 times less than that of the sun's. However, it has a carbon abundance of roughly one-tenth solar, C/H = -1.0, and it is not known how these two abundances can be produced simultaneosly. Discovered by the Hamburg/ESO survey for metal-poor stars, it was probably formed during an age of the universe when the metal content was much lower. It's been speculated that this star is part of the second generation, born out of the gas clouds which were polluted by the primordial Population III stars.
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