"That" what? A multiple-star system? Can't think of a good reason why not - Jupiter is not all that far removed from becoming a star, and it's been in orbit around Sol for quite some time, plus it has moons that are the size of solar planets. It's just a matter of orbits vs. gravity, basically. The Map does a great job of resolving the issues of how so many worlds could be terraformed if they were all in one system, since distance from their primary is a very touchy item when it comes to maintaining an environment, and keeping them in one system also negates the need for FTL drives and explains why, in some cases, it takes weeks rather than days to get to a world.
And it's just so very shiny!