Very nice star! I had a heck of a time creating a star for a recent project, but I needed it to be animated and in 3d, so a straight Photoshop job wouldn't be sufficient. You could probably still punch up its apparent brightness if you wanted:
Click image for larger version. 

Name:	Planet's-suns-and-such-(the-sun).jpg 
Views:	2485 
Size:	198.2 KB 
ID:	37689
I made a copy of the image and set it above the original with the Soft Light blending mode, then I used a Levels adjustment layer to gamma shift it and a Curves adjustment layer to push the highlights a bit more.

That Soft Light trick is handy to quickly increase the contrast and saturation of almost any image in a pleasant way. And if you blur the top layer just a bit, it can give a nice glamor to the whole thing.