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Diffraction-Limited Observations Of Binary Star Systems

Published online by Cambridge University Press:  02 August 2016

R.J. Scaddan ,
B.L. Morgan  and
J.C. Dainty
R.J. Scaddan
Affiliation:
Astronomy Group, The Blackett Laboratory, Imperial CollegePrince Consort Road, London SW7 2BZ, England
B.L. Morgan
Affiliation:
Astronomy Group, The Blackett Laboratory, Imperial CollegePrince Consort Road, London SW7 2BZ, England
J.C. Dainty
Affiliation:
Physics Department, Queen Elizabeth College, Campden Hill Road, London W8 7AH, England

Abstract

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A speckle interferometer is described which has been used to measure the separations and position angles of binary star systems. The present instrument uses an image intensifier to enable the enlarged stellar images to be recorded on cine-film. The exposure time is typically 8 msec and the camera can be operated at up to 20 frames per second. The instrument incorporates a means of calibrating the magnitude difference of the binary star systems.

A pair of achromatising lenses have been designed which will correct the radial chromatic dispersion in the speckle patterns and allow exposures to be made in “white” light. A system is under development which uses an image intensifier and a plumbicon television camera to acquire the data and a hard-wired autocorrelator to perform the analysis in real time. With this system the limiting magnitude of the technique should be significantly improved.

Type
The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 50: High Angular Resolution Stellar Interferometry , January 1979 , pp. 27-1 - 27-10
Copyright
Copyright © 1979

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