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For a binary system, Kepler's 3rd law says that the average distance between the stars cubed...

For a binary system, Kepler's 3rd law says that the average distance between the stars cubed divided by the time to complete an orbital cycle squared = sum of masses of binary stars (all in astronomical units, earth-sun distance). If this value is coined constant A, and Sa and Sb are respectively the average distance from each star to center of mass of the system, find the masses of two stars separately in terms of A, Sa and Sb.

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