High-resolution ground-based coronagraphy using image-motion compensation

Details High-resolution ground-based coronagraphy using image-motion compensation High-resolution ground-based coronagraphy using image-motion compensation

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apopt..31.4405g&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 31, no. 22, Aug. 1, 1992, p. 4405-4416.

Physics

Optics

25

Adaptive Optics, Coronagraphs, Image Motion Compensation, Power Spectra, Astronomical Photometry, Atmospheric Turbulence, Charge Coupled Devices, High Resolution, Maximum Entropy Method, Seeing (Astronomy)

Scientific paper

The first results of a new approach to ground-based stellar coronagraphy are reported. A coronagraph has been equipped with an image-motion compensation system for the stabilization of the telescope field, permitting both improved image resolution and contrast at optical wavelengths. By stopping the telescope aperture D to about four r(0), where r(0) is Fried's parameter, the maximum attainable resolution gain factor of 2.2 was achieved. Gains measured for D/r(0) greater than 14 were below the theoretical value of 1.3 theory and were indicative of centroid anisoplanatism, a small spatial coherence outer scale, or both. These effects are also evidenced by diminished power at low frequencies in the power spectrum of image motion over the full telescope aperture. A comparison of stabilized and unstabilized images shows that this coronagraph may detect circumstellar objects two magnitudes fainter than those detectable with a conventional coronagraph.

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