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Published October 20, 2004 | Published
Book Section - Chapter Open

Characterizing closure-phase measurements at IOTA

Abstract

We are working towards imaging the surfaces and circumstellar envelopes of Mira stars in the near-infrared, using the IOTA interferometer and the IONIC integrated-optics 3-beam combiner. In order to study atmospheric structures of these stars, we installed 3 narrow-band filters that subdivide H-band into 3 roughly equal-width sub-bands - a central one for continuum, and 2 adjacent ones to sample Mira star's (mostly water) absorption-bands. We present here our characterization of the IOTA 3-Telescope interferometer for closure-phase measurements with broad and narrow-band filters in the H atmospheric window. This includes characterizing the stability, chromaticity, and polarization effects of the present IOTA optics with the IONIC beam-combiner, and characterizing the accuracy of our closure phase measurements.

Additional Information

© 2004 Society of Photo-optical Instrumentation Engineers (SPIE). This work was performed in part under contract with the Jet Propulsion Laboratory (JPL) through the Michelson Fellowship to Ragland, funded by NASA as an element of the Navigator (planet finder) program. JPL is managed for NASA by the California Institute of Technology.

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