Is the star shot a few shots edited together?
And just for fun wanna share your settings and equipment?
Nope, it's a single exposure. Nikon D700, 17-35 f/2.8 lens. Exposure was 8 minutes at f/2.8 and ISO 800.
I took one more shot at 20 minutes and ISO 200 - the star trails are longer, but the northern lights are much less defined. I only got only these two exposures that night - it was too dangerous to stay out longer (there was high grizzly activity there that day).