Consider a double star system. The stars are held together as a system by the gravitational force between them. The star #1 has the mass m1 and the star #2 has the mass m2. Assume that each star undergoes a uniform circular motion about the center of mass of the system. If the stars are always at a fixed distance of D apart, what is the period of orbiting (in seconds) for each of them? Justify your answer with appropriate diagrams and equations.