Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..516v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 516-519.
Astronomy and Astrophysics
Astrophysics
Infrared Interferometers, Interferometry, Telescopes, Line Of Sight, Visible Spectrum
Scientific paper
A general scheme for choosing continuous telescope motions for interferometers operating in the visible and infrared, without delay lines, is presented. The telescopes are free to move in the ground plane, but are constrained to lie on a deforming ellipse, which projects as a circle onto the (U,V) plane. The criterion for sampling the (U,V) plane can be defined in terms of this circle. The transformation back to the ground plane then yields the required telescope motions, which automatically satisfy the condition of the ellipse. Three particular cases are discussed: (1) weak sources, for which fixed (U,V) baselines need to be tracked for longer integration times; (2) bright sources, for which the rate of coverage in the (U,V) plane can be faster than that obtained by the earth's rotation (hypersynthesis); and (3) average sources, which need no particular (U,V) constraint, so that telescopes can execute minimum motion.
Downes Dennis
Morris Dave
Vivekanand Maddali
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