Abstract
Although various observational properties have been suggested as indicators of a black hole in a binary system (e.g., rapid x‐ray fluctuations, ultra‐soft x‐ray spectra, etc.), the most certain way to determine the mass is to measure it dynamically, using observed radial velocities of the companion star. This paper discusses the x‐ray binaries for which such observational evidence for a stellar black hole is presently available.

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