Turns out I just needed a better scientific calculator and Windows 7 calculator is pathetic
So, if we use the example of Alpha Centauri again, being 1.09 solar masses, then the equation would be the following? ((1.09/1)^-2.5)x10^10, which equates to 8,061,832,212.95
Is that correct? I haven't checked out the link for Wolf Rayet stars yet but I might start reading some of it now