EDP Sciences
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Volume 368, Number 1, March II 2001
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010118

A&A 368, L1-L4 (2001)
DOI: 10.1051/0004-6361:20010118

Diffraction-limited 800 nm imaging with the 2.56 m Nordic Optical Telescope

J. E. Baldwin1, R. N. Tubbs2, G. C. Cox3, C. D. Mackay2, R. W. Wilson4 and M. I. Andersen5

1  Cavendish Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK
    e-mail: jeb@mrao.cam.ac.uk
2  Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
    e-mail: (CDM) cdm@ast.cam.ac.uk
3  Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Canarias, Spain
    e-mail: cox@not.iac.es
4  Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK
    e-mail: r.w.wilson@durham.ac.uk
5  Division of Astronomy, University of Oulu, PO Box 3000, 90014 Oulun Yliopisto, Finland
    e-mail: manderse@sun3.oulu.fi

(Received 8 December 2000 / Accepted 23 January 2001)

A quantitative assessment is presented of diffraction-limited stellar images with Strehl ratios of 0.25-0.30 obtained by selection of short-exposure CCD images of stars brighter than +6 m at 810 nm with the Nordic Optical Telescope.

Key words: atmospheric effects -- methods: observational -- stars: individual: $\beta$ Delphini -- stars: individual: $\zeta$ Boötis

Offprint request: R. N. Tubbs, rnt20@ast.cam.ac.uk

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