GI2T/REGAIN spectro-interferometry with a new infrared beam combiner

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; Farrokh Vakili

doi:10.1117/12.390261

5 July 2000 GI2T/REGAIN spectro-interferometry with a new infrared beam combiner

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, Farrokh Vakili

Author Affiliations +

Proceedings Volume 4006, Interferometry in Optical Astronomy; (2000) https://doi.org/10.1117/12.390261
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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); https://doi.org/10.1117/12.390261

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