New trends in stellar speckle interferometry.
Abstract
Recent advances are presented of the stellar speckle interferometer technique, with particular attention given to (1) the extension of the technique to infrared wavelengths, (2) improved calibration of atmospheric effects, and (3) an improved understanding of atmospheric effects. Arrays of detector elements are now available, but they are extremely expensive. Theoretical estimates of the modulation transfer function can be obtained from numerical computations, assuming log-normal statistics for the wavefront perturbations, which was first done by Korff (1973). Improved calculations, which take the central telescope obstruction into account, were made by Roddier (1979) and were found to be in good agreement with the photoelectric measurements made by Aime et al. (1979) in the visible, as well as with infrared measurements obtained by Chelli et al. (1979). The discussion of the atmospheric effects includes the effects of a single thin turbulent layer at a certain altitude above the telescope, moving at a certain wind velocity.
- Publication:
-
Applications of speckle phenomena
- Pub Date:
- January 1980
- DOI:
- 10.1117/12.959290
- Bibcode:
- 1980SPIE..243...83R
- Keywords:
-
- Atmospheric Effects;
- Calibrating;
- Infrared Interferometers;
- Interferometry;
- Speckle Patterns;
- Stellar Spectrophotometry;
- Airy Function;
- Atmospheric Turbulence;
- Autocorrelation;
- Interference Grating;
- Optical Transfer Function;
- Point Sources;
- Reference Stars;
- Spectral Energy Distribution;
- Stellar Spectra;
- Astronomy;
- Speckle Interferometry:Stars