Have a look at Physics in general as they have astronomy based topics included. Astronomy and Astrophysics looks like a post graduate course or Masters course only as it is specialised.
Myself though am doing a double degree, 1 in Physics the other in electronics. The double degree information says the selection will provide an avenue in Astronomy. I decide later depending on my strengths what I choose.
My course structure -
http://handbook.curtin.edu.au/courses/13/131510.html