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Characterizing closure-phase measurements at IOTA

  • Sam Ragland
  • , Wesley A. Traub
  • , Jean-Philippe Berger
  • , Rafael Millan-Gabet
  • , John D. Monnier
  • , Ettore Pedretti
  • , F. P. Schloerb
  • , Nathaniel P. Carleton
  • , Pierre Haguenauer
  • , Pierre Y. Kern
  • , Pierre R. Labeye
  • , Marc G. Lacasse
  • , Fabien Malbet
  • , Karine Rousselet-Perraut

Producción científica: Articlerevisión exhaustiva

7 Citas (Scopus)

Resumen

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.

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