21. Plaskett's binary system consists of two stars that reolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (Fig. P13.21). Assume the orbital speed eof each star is of each is 14.4 days, Find the mass M of each star. (For comparison, the mass of our Sun is 1.99 x 1030 kg.) = 220 km/s and the orbital period M *CM Figure P13.21

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