DIRECT-DETECTION OF THE MIRA AT THE HEART OF OH 231.8+4.2

The evolved bipolar nebula OH 231.8+4.2 is host to a Mira variable sta r, QX Pup, at its core. We used the diffraction-limited near-infrared imaging (DLIRIM) system at Kitt Peak to obtain the first direct images of this star in the near-infrared. In subarcsecond resolution DLIRIM images at K (2.2 mu m) and L' (3.8 mu m) the star is clearly detected and is well, resolved from the surrounding nebulosity. The star lies m idway between the lobes of the OH 231.8+4.2 reflection nebula, confirm ing previous inferences based on polarimetric imaging and nebular colo rs. In addition to betraying the location of the central Mira, these i mages reveal the detailed structure of OH 231.8+4.2, including a point symmetric system of jetlike features protruding from its polar lobes. The K-L' color distribution of the nebula is consistent with reflecti on and extinction of near-infrared radiation from the Mira by dust gra ins larger than those characteristic of the interstellar medium. From the apparent K magnitude of the star, combined with its relatively wel l-determined distance (1300 pc) and the circumstellar extinction we in fer from its measured K-L' color, we estimate a mean absolute magnitud e M-K similar to -10.2, comparable to Mira variables of similar (simil ar to 700 day) period in the Large Magellanic Cloud. In this and other respects, the central Mira appears remarkably ''normal'' given its po sition at the heart of such an unusual object.