| Issue |
A&A
Volume 387, Number 2, May IV 2002
|
|
|---|---|---|
| Page(s) | L21 - L24 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20020477 | |
| Published online | 13 May 2002 | |
Letter to the Editor
Diffraction-limited CCD imaging with faint reference stars
1
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
2
Cavendish Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK e-mail: jeb@mrao.cam.ac.uk
3
Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canarias, Spain e-mail: cox@not.iac.es
Corresponding author: R. N. Tubbs, rnt20@ast.cam.ac.uk
Received:
4
March
2002
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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