If you have rear Rotors, there is a complete drum inside the Rotor for the Emergency brakes. The Star wheel is an adjustment wheel for slack on this part. You need to turn the star wheel to let the Rotor slip off.
Also, block your wheels, disconnect Battery, then put Gearshift in Neutral. Turn the wheel and you can work the Rotor off. You may have to use Penetrating oil on the outside of the Rotor and the center "Ring" of the axle. Oil and turn the Rotor, 1 stud at a time.
Hit the rotor between the studs and the center of the Axle.
What you are trying to accomplish is getting oil into the stud holes so that it runs into the rotor and loosens the rust bond.
When you reassemble the parts, buy some Antiseize compound and smear it on the axle so the rotor can not rust together again.
This advice and the star wheel instructions also holds true for drum brakes too!.
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