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Differential Speckle Interferometry Applied to Double Stars

Published online by Cambridge University Press:  12 April 2016

Romain G. Petrov  and
Stephane Lagarde
Romain G. Petrov
Affiliation:
Université de Nice – Sophia Antipolis, Département d’Astrophysique, URA 709 du CNRS, Parc Valrose, 06108 Nice Cedex 2, France
Stephane Lagarde
Affiliation:
Université de Nice – Sophia Antipolis, Département d’Astrophysique, URA 709 du CNRS, Parc Valrose, 06108 Nice Cedex 2, France

Abstract

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Differential Interferometry (DI) is the application of high angular resolution interferometric techniques to objects observed simultaneously at different wavelengths. When applied to unresolved double stars it makes it possible to measure the variation of the object photocenter with wavelength, which yields angular and spectral information well beyond the classical resolution limits. Signal–to–noise ratio analysis shows that, if DI experiments are limited by photon and speckle noise, the technique can be applied to a large number of double systems for the measurement of vectorial angular separations and of radial-velocity differences. With 4-m telescopes, there are a few tens of binary systems for which DI should permit the resolution and the measurement of the position angle of the rotation axis of at least one of the components. A preliminary experiment permitted a high SNR resolution of the double star Capella with a 1.52-m telescope and showed the current limitations of DI performances resulting from an imperfect correction of detector geometrical distortions.

Type
High Resolution At Visual Wavelengths
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 477 - 485
Copyright
Copyright © Astronomical Society of the Pacific 1992

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