PHY – Suppose you have just discovered a new X-Â?ray binary
Subject: Physics / General Physics
Question
Suppose you have just discovered a new X-?ray binary, which contains a B2 main sequence star orbiting an unseen companion. The separation of stars is estimated to be 40 million km, and the orbital period of the visible star is 12 days.
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(a) Calculate the masses of the two stars in the system (watch your units, keep star masses in Msun units, put P into years and A into AU. OR use the full equation of Newton's version of Kepler's 3rd law with G and everything else in the same units as G).
(b) Estimate the mass of the unseen companion-? is it a neutron star or a black hole? Explain.
