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Detection of an inner torus in the protoplanetary nebulae OH231.8+4.2
We performed the first VLBI observations of the SiO v = 1 and v = 2 J = 1-0 masers in a Proto Planetary Nebula OH 231.8+4.2 (also known as the Rotten Egg nebula), at milliarcsecond resolution. Only the v =2 maser transition was detected. We detect several maser spots …