Physics – Optics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..661w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Feb. 1, 1984, p. 661-667.
Physics
Optics
12
Atmospheric Refraction, Design Analysis, Fiber Optics, Optical Coupling, Schmidt Telescopes, Astronomical Spectroscopy, Field Of View, Linear Arrays, Optical Correction Procedure
Scientific paper
The development of low-loss optical fibres has introduced the possibility of using a Schmidt telescope to carry out simultaneous slit spectroscopy of many objects distributed over a very wide field. The use of linear detectors in such an arrangement would permit much longer exposures than can be carried out with sky-limited photographic emulsions, so the effects of differential atmospheric refraction become a consideration in the design of the optical fibre feed. These are investigated for the case of the 1.2-m UK Schmidt telescope, where an experimental fibre coupler is being constructed. It is found that in conditions of good seeing, and with current design parameters, integrations on a point source at the extreme edge of the field will be typically limited to 4 hr, but that this figure increases rapidly for objects nearer the field centre, and may be much greater for extended objects.
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