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

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

doi:10.1117/12.7973896

1 June 1986 Images From Astronomical Speckle Data: Weighted Shift-And-Add Analysis

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

Author Affiliations +

Optical Engineering, Vol. 25, Issue 6, 256724 (June 1986). https://doi.org/10.1117/12.7973896

Abstract

We have applied a variant of the shift-and-add algorithm originally developed by Lynds, Worden, and Harvey [Astrophys. J. 207, 174 (1976)] to astronomical speckle interferometric data. A set of impulses corresponding in locations and magnitudes 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 that 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 ratio 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. A matched filter technique is demonstrated for use in locating the speckles of complicated objects or for objects dominated by photon noise.

Citation Download Citation

J. C. Christou, E. Ribak, E. K. Hege, and J. D. Freeman "Images From Astronomical Speckle Data: Weighted Shift-And-Add Analysis," Optical Engineering 25(6), 256724 (1 June 1986). https://doi.org/10.1117/12.7973896

Published: 1 June 1986

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