Abstract
We discuss implementation and testing of phase referencing at the Palomar Testbed Interferometer. A new instrument configuration provides a coherent integration of 10 or 20 ms on a bright star while stabilizing the fringe phase of a nearby (20'') and faint visual companion, allowing coherent integration times of at least 250 ms. Observations have been made of several visual binaries, including 16 Cyg AB (mK = 4.5 and mK = 4.6) and HD 173648/49 (mK = 4.3 and mK ~ 5) to test the performance of the technique. These measurements also demonstrate that phase-referenced visibility measurements can be calibrated at the level of 3%–7%.
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