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http://blogs.discovermagazine.com/badastronomy/2011/04/05/astronomers-may-have-witnessed-a-star-torn-apart-by-a-black-hole/

A lot of the star in the disc, a lot of the star in the jets, precisely how much of the star actually falls into the black hole?

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There is no correct answer for all cases. Of course the upper-bound is 100% but in practice, even if nearly all of the matter would fall in, a huge amount of energy will be radiated as x-rays and $\gamma$-rays due to heating in the accretion disk.

The dynamics of in-falling matter are quite complicated and very sensitive to initial conditions. Currently super computers are required to answer this question in any detail for a given set of initial conditions.

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