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=== X-ray binaries ===
If the accretor in an [[X-ray binary]] has a minimum mass that significantly exceeds the [[Tolman–Oppenheimer–Volkoff limit]] (the maximum possible mass for a [[neutron star]]), it is expected to be a black hole. This is the case in [[Cygnus X-1]], for example, where the radial velocity of the companion star has been measured.<ref>{{citation | last=Mauder | first=H. | date=1973 | title=On the Mass Limit of the X-ray Source in Cygnus X-1 | bibcode=1973A&A....28..473M | journal=[[Astronomy and Astrophysics]] | volume=28 | pages=473–475}}</ref><ref>[http://imagine.gsfc.nasa.gov/features/yba/cyg-X1-mass/mass-solution3.html NASA – Imagine the Universe! Partial Solution for Mass of Cyg X-1]{{dead link|date=November 2016 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
=== Exoplanets ===
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