Fall 2009 ASTR 2030 Homepage
Cygnus X-1 (black hole)
The mass of Cygnus-X1 been measured to be 14.8 ± 1.0 solar masses (Orosz et al. 2011 “The Mass of the Black Hole in Cygnus X-1”).
X-ray
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Optical
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Hercules X-1 (neutron star)
The microquasar (x-ray binary with jets) XTE J1550-564
