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Calculate the Schwarzschild radius of a 3-M object. The orbital period and separation of the Cygnus...

Calculate the Schwarzschild radius of a 3-M object.

  1. The orbital period and separation of the Cygnus X-1 binary system are 5.6 days and 0.2 AU respectively. If the visible B-type supergiant has a mass of 19 M, what is the mass of the unseen companion.

  2. What is the Schwarzschild radius of the invisible companion?

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