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Paper: The mass of the black hole in GS 2000+25
Volume: 261, The Physics of Cataclysmic Variables and Related Objects
Page: 285
Authors: Ioannou, Z.; Robinson, E. L.; Welsh, W. F.; Haswell, C. A.
Abstract: The quiescent light curve of the soft X-ray transient GS 2000+25 is dominated by ellipsoidal variation due to the distorted shape of the secondary star. By modeling the light curve we were able to put tight constraints on the inclination (57circ < i < 65circ) and also place a lower limit to the mass of the central object of 5.66 Modot, which is well above the maximum mass of a slowly rotating neutron star.
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