5 July 2000 GI2T/REGAIN spectro-interferometry with a new infrared beam combiner
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Abstract
We have built an infrared beam combiner for the GI2T/REGAIN interferometer of the Observatoire de la Cote d'Azur. The beam controller allows us to record spectrally dispersed Michelson interference fringes in the near-infrared J-, H- or K-bands. The beam combiner has the advantage that Michelson interferograms can simultaneously be recorded in about 128 different spectral channels. The tilt of the spectrally dispersed fringes is a measure of the instantaneous optical path difference. We present the optical design of the beam combiner and GI2T/REGAIN observations of the Mira star R Cas with this beam combiner in the spectral range of 2.00 micrometers - 2.18 micrometers (observations on 22 and 25 August 1999; variability phase 0.08; V-magnitude approximately 6; seven baselines between 12 m and 24 m; reference stars Vega and (beta) Peg).
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Gerd Weigelt, Denis Mourard, Lyu Abe, Udo Beckmann, Olivier Chesneau, C. Hillemanns, Karl-Heinz Hofmann, Sam D. Ragland, Dieter Schertl, Michael Scholz, Philippe Stee, Nathalie D. Thureau, and Farrokh Vakili "GI2T/REGAIN spectro-interferometry with a new infrared beam combiner", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390261; https://doi.org/10.1117/12.390261
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