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Simultaneous Spectroscopic and Interferometric Measurements of Binaries with the GI2T

Published online by Cambridge University Press:  12 April 2016

D. Mourard ,
D. Bonneau ,
A. Blazit ,
A. Labeyrie ,
F. Morand ,
I. Percheron ,
I. Tallon–Bosc  and
F. Vakili
D. Mourard
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
D. Bonneau
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
A. Blazit
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
A. Labeyrie
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
F. Morand
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
I. Percheron
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
I. Tallon–Bosc
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France
F. Vakili
Affiliation:
Observatoire de la Côte d’Azur, Dpt Fresnel, URA1361, 06460 Saint Vallier de Thiey, France

Extract

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The “Grand Interféromètre à deux Télescopes” (GI2T) is presently the largest operational interferometer operating at visible wavelengths (Labeyrie et al. 1986, Mourard et al. 1991). With two telescopes of 1.5-m aperture and baselines reaching 65 m in the North–South direction, it gives stellar spectra containing interference fringes, which provide high angular resolution measurements in the range of one milliarcsecond.

The GI2T optical combination follows the Michelson principle of output pupil remapping to preserve a constant fringe spacing on the detector for stable and economical spatial sampling. The stellar light is dispersed in order to study the fringes parameters simultaneously with the spectral information. The direction of dispersion is perpendicular to that of the recombined pupils. Due to atmospheric turbulence the instantaneous images contain about 100 speckles. To freeze the atmospheric turbulence a temporal resolution of at least 10 milliseconds is needed.

Type
High Resolution At Visual Wavelengths
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 510 - 520
Copyright
Copyright © Astronomical Society of the Pacific 1992

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