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Registration of H<sub>2</sub>O and SiO masers in the Calabash Nebula, to confirm the Planetary Nebula paradigm
Abstract We report on the astrometric registration of VLBI images of the SiO and H 2 O masers in OH 231.8+4.2, the iconic Proto-Planetary Nebula also known as the Calabash nebula, using the KVN and Source/Frequency Phase Referencing. This, for the first time, robustly confirms the alignment of the SiO …