Differential speckle interferometry has been applied to data obtained using the fully phased six-mirror aperture of the Multiple Mirror Telescope. Wavelength-dependent differences in the appearance of a stellar object are derived from simultaneous observations at two distinct wavebands. The supergiant star Alpha Orionis was observed this way to investigate its appearance in hydrogen-alpha emission. Data reduction consists of a frame-by-frame weighted deconvolution. An inherent Wiener-type filtering must be removed in order to preserve high spatial frequency information. Results for Alpha Orionis are compared to similar results for the unresolved source Gamma Orionis.
J. C. Hebden,
E. K. Hege,
Jacques M. Beckers,
"Differential Speckle Imaging With The Cophased Multiple Mirror Telescope," Optical Engineering 25(6), 256712 (1 June 1986). https://doi.org/10.1117/12.7973894