Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-13
Astrophys.J.692:924-930,2009
Astronomy and Astrophysics
Astrophysics
6 pages, 11 figures. Submitted to ApJ
Scientific paper
10.1088/0004-637X/692/1/924
We describe the results from a new instrument which combines Lucky Imaging and Adaptive Optics to give the first routine direct diffraction-limited imaging in the visible on a 5m telescope. With fast image selection behind the Palomar AO system we obtained Strehl ratios of 5-20% at 700 nm in a typical range of seeing conditions, with a median Strehl of approximately 12% when 10% of the input frames are selected. At wavelengths around 700 nm the system gave diffraction-limited 35 milliarcsecond FWHMs. At 950 nm the output Strehl ratio was as high as 36% and at 500 nm the FWHM resolution was as small as 42 milliarcseconds, with a low Strehl ratio but resolution improved by factor of ~20 compared to the prevailing seeing. To obtain wider fields we also used multiple Lucky-Imaging guide stars in a configuration similar to a ground layer adaptive optics system. With eight guide stars but very undersampled data we obtained 300 milliarcsecond resolution across a 30X30 arcsec field of view in i' band.
Dekany Richard George
Ireland Mike
Law Nicholas M.
Lloyd James P.
Mackay Craig D.
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