A high-Strehl low-resoultion optical imager (BESSEL): Detection of a 0.7(lambda)/D separation binary for mte ground

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Title: A high-Strehl low-resoultion optical imager (BESSEL): Detection of a 0.7(lambda)/D separation binary for mte ground
Author: Peters, Mary Anne; Close, Laird; Rademacher, Matt; Stalcup, Tom; Swartzlander, Grover Jr; Ford, Erin; Abdul-Malik, Rukiah
Abstract: We have constructed a high-speed image stabilization system, BESSEL, which mounts to the 8-in. refractive telescope coupled to the ray white telescope at steward observatory. The high-speed tip/tilt mirror platform is controlled by an Andor electron multiplication EMCCD enabling wavefront correction at a rate exceeding 1 kHz. BESSEL achieves on-sky Strehl ratios of 98–99% at lambda) = 800 nm when the telescope aperture is stopped down to half the Fried parameter (typically D = 25.4 mm, where D is the diameter of the effective telescope aperture). Utilizing high Strehls and the technique of roll subtraction enabled BESSEL to resolve the binary, ADS 10418AB (more commonly known as a Her), with separation of only 0.719(lambda)/D and a delta magnitude of ~3 mag at 800 nm. In addition, Arcturus was observed with BESSEL to explore a relatively untested region of Strehl versus D/r0 parameter space in the optical, specifically at small (~0.5D/r0). We find that in this regime space quality, very high Strehl (~99%), optical imaging can be obtained from the ground when D/r0 < 0.5 as one approaches the inner scale of turbulence. Because of BESSEL’s demonstrated high Strehls, it is an ideal platform for inexpensive, initial, on-sky characterization of space-based coronagraphs, for which it will be used in the near future.
Record URI: http://hdl.handle.net/1850/12441
Date: 2008

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