The basic premise of an iron star is a 'dead' star whose mass is made primarily of iron. It's a hypothetical type of compact star. Wikipedia has a bit of a blurg here: https://en.wikipedia.org/wiki/Iron_star
The process of forming an iron star would be tricky, because normally iron does not fuse and so the star would normally collapse under it's own weight - this is why the Wiki article describes a cold-fusion process via quantum tunneling processes.
This article describes the process of fusion in stars and might help you understand why this is more significant compared to regular stars: http://www.eso.org/public/usa/news/eso0129/
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