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The point about the links Rob posted was that in an insanely small and seemiingly empty bit of the sky in Virgo, these guys found 350 red giants that were orphans. The ration of red dwarfs to 'others' in our galaxy is about 2:1. Assuming those orphans were the by-product of a galactic collision/stripping/whatever the likely proportions of stars stripped and flung out into the void wouldn't differ all that much. So there is probably a much bigger population of stars out there, too small and too dim to be seen individually.
So AlexN, while you say escapes are not impossible but unlikely, it would seem that a small patch of empty sky in Virgo says you're wrong. These orphans, it is said are beyond the gravitational reach of their progenitor galaxies, but are probably within that of the galaxy cluster in which they move.
As for B1 and B2, ....
Peter
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