Characterizing closure-phase measurements at IOTA

S. Ragland, W.~A. Traub, J.-P. Berger, R. Millan-Gabet, J.~D. Monnier, E. Pedretti, F.~P. Schloerb, N.~P. Carleton, P. Haguenauer, P.~Y. Kern, P.~R. Labeye, M.~G. Lacasse, F. Malbet, K. Rousselet-Perraut

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


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.
Original languageUndefined/Unknown
Title of host publicationNew Frontiers in Stellar Interferometry
EditorsW.~A. Traub
Number of pages1
Publication statusPublished - 20 Oct 2004

Publication series

NameSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series

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