Starry Starry Night

I was out playing with the ISO setting on my camera tonight, preparing for an attempt at timelapse over night, when I got this shot. Notice if you can that some of the stars are red. I reviewed all of the images that I shot and the same stars from shot to shot are indeed red. I don't know if this is due to the image being digital or not but I don't think so since it is the same stars in each shot.

Bad news is I forgot what settings weere for which shot. Oh well I guess I'll have to extend the experiment...Yay!