Low dispersion survey spectrograph for the William Herschel Telescope
- 1 July 1990
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- Vol. 1235, 691-702
- https://doi.org/10.1117/12.19132
Abstract
This paper describes the Low Dispersion Survey Sectrograph (LDSS-2) currently under construction for the 4.2-m William Herschel Telescope. The instrument is a versatile highly efficient multiobject spectrograph with an 11.5-arcmin field of view. Around 100 objects can be observed simultaneously using multiaperture masks made at the telescope in real-time at dispersions selectable between 10 and 47 nm/mm. By removing the dispersing element, the instrument can act as a focal reducer with a final focal ratio of f/2. This allows the field to be imaged first in order to derive accurate instrumental coordinates for the manufacture of the aperture mask.Keywords
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