= Jerome A. Orosz
{c}
{tag=Physicist}
<Jerome A. Orosz> coauthored a dynamical model of <Cygnus X-1> that combines optical <light curves>, companion-star <radial velocities>, rotational broadening and a distance constraint to infer the <black hole>'s mass.<The Mass of the Black Hole in Cygnus X-1 by Jerome A. Orosz and others>[Abstract: photometric/spectroscopic constraints and binary model]{ref}
The measurements constrain different parts of the binary geometry. Radial motion alone leaves an inclination dependence; stellar size and light-curve information help determine the scale and orientation. The quoted paper is a specific historical analysis, so its parameter estimates should not be mistaken for an automatically current calibration.
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