Neutron stars on collision course.

[Pds3.14]

Simply put, either by chance or a suicidal type-III Civilization, 2 neutron stars, or a neutron star an a large-ish main sequence star are thrown at each other and fall STRAIGHT into each other.
What happens? Does the ~1.4 C Newtonian impact speed result in them getting blown up and releasing their mass-energy into the universe? making a black hole? something else?

For the sake of consistency, let us assume that each neutron star is 2 Solar masses with a radius of 6 km, this also happens to be hovering on the edge of becoming a black hole. (pciked values arbitrarily, got 99.5C as escape velocity.)

By the way, preliminary calculations of the mass-energy of each seem to indicate a yield of 6.4E47 Joules, if that is what would happen.

 

[Drakkith]

Note that neither star see's the other as approaching at 1.4 c due to the way velocities add in special relativity.

What would happen is that they would collide and turn into a black hole.

 

[Pds3.14]

Note that neither star see's the other as approaching at 1.4 c due to the way velocities add in special relativity.

What would happen is that they would collide and turn into a black hole.

Hmm... I guess that upon contact, they would be nearly in the event horizon...

What about if they were insufficiently massive to do so, e.g. 1 solar mass each and the same radius as before?