Revisiting the impact of atmospheric dispersion and differential refraction on widefield multiobject spectroscopic observations
2014; EDP Sciences; Volume: 566; Linguagem: Inglês
10.1051/0004-6361/201423459
ISSN1432-0746
AutoresRubén Sánchez-Janssen, Steffen Mieske, F. Selman, Paul Bristow, P. L. Hammersley, M. Hilker, M. Rejkuba, B. Wolff,
Tópico(s)Optical Wireless Communication Technologies
ResumoContext. Atmospheric dispersion and field differential refraction impose severe constraints on widefield, multiobject spectroscopic (MOS) observations, where the two joint effects cannot be continuously corrected. Flux reduction and spectral distortions must then be minimised by a careful planning of the observations, which is especially true for instruments that use slits instead of fibres. This is the case of VIMOS at the VLT, where MOS observations have been restricted, since the start of operations, to a narrow two-hour range from the meridian to minimise slit losses, the so-called two-hour angle rule.
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