Volume 387, Number 2, May IV 2002
|Page(s)||L21 - L24|
|Published online||13 May 2002|
Letter to the Editor
Diffraction-limited CCD imaging with faint reference stars
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
2 Cavendish Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK e-mail: firstname.lastname@example.org
3 Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canarias, Spain e-mail: email@example.com
Corresponding author: R. N. Tubbs, firstname.lastname@example.org
Accepted: 26 March 2002
By selecting short exposure images taken using a CCD with negligible readout noise we obtained essentially diffraction-limited 810 nm images of faint objects using nearby reference stars brighter than at a 2.56 m telescope. The FWHM of the isoplanatic patch for the technique is found to be 50 arcseconds, providing ~20% sky coverage around suitable reference stars.
Key words: techniques: high angular resolution / instrumentation: detectors / globular clusters: individual: M 13
© ESO, 2002
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