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The have to remember, because they have seem to have forgot their basic maths for planets in orbits around multiple stars, that stable orbits will occur around the stars in multiple system where the planets orbiting in the plane of the system are equal to or less than 1/5th the distance from their parent star as the minimal distance between the stars in their orbits.
Despite star A being a binary, if they're close enough together they will appear as one body gravitationally to the other star B and to any planets orbiting that star. It appears that they are. So, for star B, if the minimal distance between stars A and B in their orbit were, say, 300AU, then the planets of star B could exist in stable orbits out to 60AU, providing they orbited in the plane of the system as whole. If they orbit at high inclinations to the system, the orbits become unstable at much closer separations because the planets are open to the gravitational influence of the component stars more severely. Other stable orbits will occur if the planets orbit the barycentre of the entire system. i.e. they orbit the centre of gravity of the all three stars instead of just one or more components of the system.
However, chaotic motions in the orbits can still occur no matter where they orbit in the system.
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