Abstract
We present the infrared angular diameter of Mira variable U Ori, obtained from lunar occultation observations at 2.2 μm. The uniform disc (UD) angular diameter is determined to be 11.9 ± 0.3 mas at variability phase 0.28. The source brightness profile derived from a model-independent analysis shows an asymmetric spatial structure. The dispersion in UD angular diameter measurements in comparison with other similar measurements at the same phase in the near-infrared can be explained by a spatial asymmetry of the source, being elongated in the direction northeast - southwest, at position angle of 50°-70°. Several corollary evidences for the spatial asymmetry of the source are presented.
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