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VLA observations of H2O and OH (1612 MHz) maser emission towards OH 231.8+4.2

We present Very Large Array (VLA) observations of H2O and OH (1612 MHz) maser emission toward the protoplanetary nebula OH 231.8+4.2. The H2O maser features are coincident in position within error with the SiO (v=1; J=2-1) maser position from Sánchez Contreras et al. (2000) and the QX Pup Mira star near the center of OH 231.8+4.2 from Kastner et al. (1998). This position is, however, clearly offset by ∼1 from the axis of the bipolar outflow traced by the OH maser emission. These results suggest the presence of a binary system: one invisible star powering the bipolar outflow and the other, the Mira star QX Pup, associated with the H2O and SiO masers.