Bibcode
Altarac, S.; Berlioz-Arthaud, P.; Thiébaut, E.; Foy, R.; Balega, Y. Y.; Dainty, J. C.; Fuensalida, J. J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 1, pp. 141-148.
Fecha de publicación:
3
2001
Número de citas
11
Número de citas referidas
9
Descripción
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.