Investigations of the stellar disk of alpha orionis at visible wavelengths

H. Weghorn

doi:10.1117/12.2308604

26 July 1993 Investigations of the stellar disk of alpha orionis at visible wavelengths

H. Weghorn

Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 198355 (1993) https://doi.org/10.1117/12.2308604
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary

Abstract

Short-time exposures of stars with large optical telescopes at limited bandwidth consist of interference minima and maxima instead of the theoretical diffraction pattern of an Airy disk. This effect originates in the turbulent atmosphere above the telescope. These interference patterns are called speckle interferograms. Their smallest structures, the speckles, are of the size of the Airy disk and the centroided speckle average has exactly the shape of the Airy disk. The shift-and-add algorithm uses this fact to produce a sharp image of unresolvable single stars of nearly theoretical resolution. For extended stellar disks the result is a convolution of the stellar shape and the Airy disk, which allows the measurement of the star diameter. The application to 2.2-m speckle data of the prototype star a Orionis for the wavelengths H, and 535 nm is reported.

Citation Download Citation

H. Weghorn "Investigations of the stellar disk of alpha orionis at visible wavelengths", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198355 (26 July 1993); https://doi.org/10.1117/12.2308604

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