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Sub-resolution limit spatio-spectral information using Differential Speckle Interferometry

Published online by Cambridge University Press:  12 April 2016

S. Lagarde ,
L.J. Sánchez  and
R.G. Petrov
S. Lagarde
Affiliation:
Département d’Astrophysique, Universit de Nice-Sophia Antipolis, U.R.A. 709 du C.N.R.S, O6108 Nice Cedex 2, France
L.J. Sánchez
Affiliation:
Département d’Astrophysique, Universit de Nice-Sophia Antipolis, U.R.A. 709 du C.N.R.S, O6108 Nice Cedex 2, France
R.G. Petrov
Affiliation:
Département d’Astrophysique, Universit de Nice-Sophia Antipolis, U.R.A. 709 du C.N.R.S, O6108 Nice Cedex 2, France

Abstract

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Differential Speckle Interferometry (DSI) combines high angular resolution techniques with medium to high resolution spectroscopy. For non resolved sources, it yields the displacement of the object photocenter with wavelength. Combined with the spectrum s (λ), can give information with spatial and/or spectral resolution well beyond the telescope or spectrograph limits. This complementarity is illustrated here with experimental results. For the binary system Capella, we measure the angular separation, separate the spectra of the components and derive the radial velocity difference and the rotation velocity of each component. For the slowly rotating star Aldebaran we obtain the position angle of the stellar rotation axis and a relation between the angular diameter and the rotation velocity which in this case gives the latest.

Type
5. Miscellaneous Methods
Information
International Astronomical Union Colloquium , Volume 149: Tridimensional Optical Spectroscopic Methods in Astrophysics , 1995 , pp. 360 - 364
Copyright
Copyright © Astronomical Society of the Pacific 1995

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