Open AccessEffect of telescope vibrations upon high angular resolution imaging
Author(s) -
Altarac S.,
BerliozArthaud P.,
Thiébaut E.,
Foy R.,
Balega Y. Y.,
Dainty J. C.,
Fuensalida J. J.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04111.x
Subject(s) - physics , telescope , angular resolution (graph drawing) , azimuth , astronomy , william herschel telescope , optics , zenith , interferometry , optical telescope , spectral line , spectral resolution , speckle imaging , resolution (logic) , astrophysics , spectrograph , mathematics , combinatorics , artificial intelligence , computer science
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.