![Distribution of the masses of compact objects in X ray binaries. Neutron stars have a mass of around 1.4 solar masses, with very slight dispersion. The average mass of a black hole is around 10 solar masses, and all have a mass greater than 4 solar masses Distribution of the masses of compact objects in X ray binaries. Neutron stars have a mass of around 1.4 solar masses, with very slight dispersion. The average mass of a black hole is around 10 solar masses, and all have a mass greater than 4 solar masses](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados17_18.jpg?itok=hdMNNGAd)
The range of masses for the compact object in binary r-X 2S 0921-630 has been determined (between 2.0-4.3 solar masses), consistent with a massive neutron star or a low-mass black hole.
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