Images From Astronomical Speckle Data: Weighted Shift-and-Add Analysis

J. C. Christou; E. K . Hege; J. D. Freeman; E. Ribak

doi:10.1117/12.949548

25 November 1985 Images From Astronomical Speckle Data: Weighted Shift-and-Add Analysis

J. C. Christou, E. K . Hege, J. D. Freeman, E. Ribak

Proceedings Volume 0556, Intl Conf on Speckle; (1985) https://doi.org/10.1117/12.949548
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

We have applied a variant of the Shift-and-Add algorithm originally developed by Lynds, Worden & Harvey to astronomical speckle interferometric data. A set of impulses corresponding in location and magnitude to the local maxima in each specklegram is generated and used to obtain an average speckle by means of a Wiener-type filter deconvolution procedure. This technique yields diffraction limited images which appear to be self calibrating for seeing effects. Realistic point spread functions have been obtained for a number of telescopes at different wavelengths and results are also presented for the resolved red supergiant Alpha Orionis. The limiting signal-to-noise of the technique as indicated by the results presented here suggests a dynamic range of ~6 stellar magnitudes with no evidence of residual seeing effects.

Citation Download Citation

J. C. Christou, E. K . Hege, J. D. Freeman, and E. Ribak "Images From Astronomical Speckle Data: Weighted Shift-and-Add Analysis", Proc. SPIE 0556, Intl Conf on Speckle, (25 November 1985); https://doi.org/10.1117/12.949548

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