In a binary star system,an unseen component is found to have 8 solar masses.It would be visible if the system were a normal star,so it must be a collapsed object.Theoretical considerations tell us that it must be a:

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The fact that the unseen component has 8 solar masses indicates that it is too massive to be a neutron star or a white dwarf. A brown dwarf would also be visible if it were in a binary system. Therefore, the only option that fits in with the given information is that the unseen component is a black hole.

In a Binary Star System,an Unseen Component Is Found to Have