>>13978229About 3 solar masses. If you manage to dump it on all at once the sun should become a black hole. This probably wouldn't work (but would certainly look neat) because it's more likely that the oxygen and hydrogen would simply break down and become more fuel for the star.
So just to be sure add about 100 solar masses and the star will tear itself apart in a massive explosion since it won't be able to overcome the nuclear pressure.
