You are studying a mystery companion to an evolved star, with mass transfer happening. Which of the following properties suggests that the companion is definitely a black hole?
A) The mystery companion has a mass of over 3 solar masses.
B) The mystery companion gives off periodic X- ray bursts.
C) The mystery companion has an X- ray emitting accretion disk.
D) The mystery companion has a mass of over 1.4 solar masses.
Correct Answer:
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A)The binary companion
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