Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-26
Mon.Not.Roy.Astron.Soc.364:1203-1210,2005
Astronomy and Astrophysics
Astrophysics
9 pages, 16 figures. Accepted for publication in the Monthly Notices of the Royal Astronomical Society. A higher res PDF can b
Scientific paper
10.1111/j.1365-2966.2005.09628.x
Described here is the design and commissioning of a coronagraph facility for the 4.2 metre William Herschel Telescope (WHT) and its Nasmyth Adaptive Optics system for Multi-purpose Instrumentation (NAOMI). The use of the NAOMI system gives an improved image resolution of ~0.15 arcsecs at a wavelength of 2.2um. This enables the Optimised Stellar Coronagraph for Adaptive optics (OSCA) to suppress stellar light using smaller occulting masks and thus allows regions closer to bright astronomical objects to be imaged. OSCA provides a selection of 10 different occulting masks with sizes of 0.25 - 2.0 arcsecs in diameter, including two with full greyscale Gaussian profiles. There is also a choice of different sized and shaped Lyot stops (pupil plane masks). Computer simulations of the different coronagraphic options with the NAOMI segmented mirror have relevance for the next generation of highly segmented extremely large telescopes.
Bingham Richard G.
Bissonauth Nirmal
Charalambous Andrew
Clark Paul
Doel Andrew P.
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