STELLAR SPECKLE IMAGING BY REFERENCE TO DIFFERENT-COLORED SPECKLEGRAMS

Stellar specklegrams at different wavelengths are examined. The positi on of the brightest speckle at one wavelength is shown to coincide nea rly with that at a widely separated wavelength. The shift-and-add oper ation for specklegrams at one wavelength produces a high-resolution st ellar image at the other wavelength. We show that the shift-and-add op eration at 450 nm results in a high-resolution image at 800 nm by use of observational speckle data from which specklegrams at these wavelen gths are taken simultaneously.