Effect of telescope vibrations upon high angular resolution imaging

Details Effect of telescope vibrations upon high angular resolution imaging Effect of telescope vibrations upon high angular resolution imaging

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.322..141a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 1, pp. 141-148.

Astronomy and Astrophysics

Astronomy

3

Atmospheric Effects, Instrumentation: High Angular Resolution, Methods: Data Analysis, Techniques: High Angular Resolution, Techniques: Image Processing, Telescopes

Scientific paper

We have analysed short-exposure high-resolution images obtained on the William Herschel Telescope (WHT), Big Telescope Azimuthal (BTA) and Canada-France-Hawaii Telescope (CFHT) in order to investigate mechanical vibrations that are capable of reducing the high angular resolution allowed by speckle-interferometric methods. After filtering the photon noise we have computed power spectra of the image centres of gravity. In these spectra we have found vibration features that differ from one telescope to another and that vary in particular with the zenith angle. In the case of the WHT we discuss these results in terms of possible causes and in terms of degradation of the transfer function. We present some means to improve the data.

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