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Proceedings Paper

Handling atmospheric dispersion and differential refraction effects in large-field multiobject spectroscopic observations
Author(s): Jean Gabriel Cuby; D. Bottini; Jean Pierre Picat
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Paper Abstract

The atmospheric refraction affects the position of objects in the sky in two ways: a chromatic effect and a field differential effect. The former is about the same in the field and can be, in principle, corrected using an Atmospheric Dispersion Compensator (ADC). The latter is dependent of the field size and cannot be corrected. For spectroscopy in wide fields, both effects have to be carefully considered because they affect the spectrophotometry in terms of signal to noise ratio and spectral distortions. The present study aims to evaluate the atmospheric effects in the case of the VIMOS instrument for the ESO VLT. It is shown that provided a careful operational mode the distortion of spectra can be kept at a level less than 15% with reasonable constraints.

Paper Details

Date Published: 9 July 1998
PDF: 12 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316769
Show Author Affiliations
Jean Gabriel Cuby, European Southern Observatory (Chile)
D. Bottini, Istituto di Fisica Cosmica (Italy)
Jean Pierre Picat, Observatoire Midi-Pyrenees (France)

Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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