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Use of Large Telescopes in Fast Focal Ratio Mode – Application to the 6m Telescope (BTA)

Published online by Cambridge University Press:  12 April 2016

G. Courtes ,
J. Boulesteix ,
J.P. Sivan ,
H. Petit  and
I. Karachentsev
G. Courtes
Affiliation:
Observatoire de Marseille and Laboratoire d'Astronomie Spatiale du C.N.R.S., Marseille
J. Boulesteix
Affiliation:
Observatoire de Marseille and Laboratoire d'Astronomie Spatiale du C.N.R.S., Marseille
J.P. Sivan
Affiliation:
Observatoire de Marseille and Laboratoire d'Astronomie Spatiale du C.N.R.S., Marseille
H. Petit
Affiliation:
Observatoire de Marseille and Laboratoire d'Astronomie Spatiale du C.N.R.S., Marseille
I. Karachentsev
Affiliation:
Special Astrophysical Observatory, Nizhnij Arkhyz, Stavropolskij Kraj 357140, USSR

Abstract

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Large aperture telescopes usually have an unavoidably long focal length so that stellar image diameters are often much larger than the resolution of the detector. The detection of extended sources can take advantage of a faster focal ratio and both stellar and extended monochromatic sources can be detected with great sensitivity by using interference filters and a focal reducer, without much loss in resolution. Extragalactic results obtained with the 6 meter telescope at focal ratio f/1 are given as examples.

Type
Section I: Optical Telescopes, Existing And Planned
Information
International Astronomical Union Colloquium , Volume 67: Instrumentation for Astronomy with Large Optical Telescopes , 1982 , pp. 67 - 71
Copyright
Copyright © Reidel 1982

References

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