Question

You've just discovered another new x-ray binary, which we will call Hyp-X2 ("Hyp" for hypothetical). The system Hyp-X2 contains a bright, G2 main-sequence star orbiting an unseen companion. The separation of the stars is estimated to be 13 million kilometers, and the orbital period of the visible star is 4.7 days.

Use Newton's version of Kepler's third law to calculate the sum of the masses of the two stars in the system.

Express your answer using two significant figures and include the appropriate units.

Answer 1