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26 July 2016 Interferometric field of view measurements at the VLTI
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In August 2014 we performed technical observations at the VLTI with the AMBER and PIONIER beam combiners to measure the interferometric field of view (FOV). As targets we included binaries with component separations between 100 and 300 mas, for which orbits and/or interferometric speckle measurements are available from the Washington Double Star databases or from the literature. The analysis included effects such as bandwidth and time smearing of the interferograms, and photometric attenuation due to the seeing and image quality based on a new formalism of the ESO Exposure Time Calculators. We also consulted the literature for results of interferometric surveys such as the SMASH survey.1 to estimate the effective FOV for these instruments. Based on our analysis, we conclude that emission outside a FOV diameter of 160 mas will be significantly suppressed if not completely invisible. These results provide important information as to the size of the source structure to be included when modeling interferometric data obtained with these instruments.
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Christian A. Hummel, Jean-Baptiste Le Bouquin, and Antoine Merand "Interferometric field of view measurements at the VLTI", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99073B (26 July 2016);

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