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[http://dummy.us.eu.org/robert (Robert)]

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 > them," says Rivinius.  Baade adds that finding a black hole in a
 > triple system so close by indicates that we are seeing just "the
 > tip of an exciting iceberg."
 > 
 > Already, astronomers believe their discovery could shine some light
 > on a second system.  "We realised that another system, called LB-1,
 > may also be such a triple, though we'd need more observations to
 > say for sure," says Marianne Heida, a postdoctoral fellow at ESO
 > and co-author of the paper.  "LB-1 is a bit further away from Earth
 > but still pretty close in astronomical terms, so that means that
 > probably many more of these systems exist.  By finding and studying
 > them we can learn a lot about the formation and evolution of those
 > rare stars that begin their lives with more than about 8 times the
 > mass of the Sun and end them in a supernova explosion that leaves
 > behind a black hole."
 > 
 > The discoveries of these triple systems with an inner pair and a
 > distant star could also provide clues about the violent cosmic
 > mergers that release gravitational waves powerful enough to be
 > detected on Earth.  Some astronomers believe that the mergers can
 > happen in systems with a similar configuration to HR 6819 or LB-1,
 > but where the inner pair is made up of two black holes or of a
 > black hole and a neutron star.  The distant outer object can
 > gravitationally impact the inner pair in such a way that it
 > triggers a merger and the release of gravitational waves.  Although
 > HR 6819 and LB-1 have only one black hole and no neutron stars,
 > these systems could help scientists understand how stellar
 > collisions can happen in triple star systems.
 > 
 > This research was presented in the paper "A naked-eye triple system
 > with a nonaccreting black hole in the inner binary", published
 > today in Astronomy & Astrophysics.
 > 
 > More information: "A naked-eye triple system with a nonaccreting
 > black hole in the inner binary", Astronomy & Astrophysics (2020).
 > DOI: 10.1051/0004-6361/2020380