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Proceedings Paper

Faint object spectrograph for the William Herschel Telescope
Author(s): Jeremy R. Allington-Smith; J. Mike Breare; Richard S. Ellis; Ian Robert Parry; John Webster; David W. Gellatly; Susan P. Worswick
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Paper Abstract

The design and performance of the FOS-2 faint-object spectrograph for the Herschel Telescope at the Observatorio del Roque de los Muchachos are described and illustrated with diagrams and drawings. The FOS-2 has an image scale of 223 microns/arcsec at the slit and features a cryostat-cooled 385 x 578-pixel CCD detector with 22-micron-sq pixels, operating with resolution 1.5 pixels and dispersion 8.73 A/pixel at 460-970 nm (first order) or 4.32 A/pixel at 350-490 nm (second order). The high-efficiency optical system is of the type described by Wynne (1982) and operates in the diverging f/11 Cassegrain beam without a collimator. Overall system efficiency in first order with a 5-arcsec slit has a peak at 16 percent at 700 nm and remains above 1 percent at all wavelengths imaged by the CCD; in second order the peak efficiency is about 3 percent at 490 nm and remains above 1 percent except below 370 nm. The mechanical system, the control and data acquisition procedures, and the data-reduction software are briefly discussed.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19116
Show Author Affiliations
Jeremy R. Allington-Smith, Univ. of Durham (United Kingdom)
J. Mike Breare, Univ. of Durham (United Kingdom)
Richard S. Ellis, Univ. of Durham (United States)
Ian Robert Parry, Univ. of Durham (United Kingdom)
John Webster, Univ. of Durham (United Kingdom)
David W. Gellatly, Royal Greenwich Observatory (United States)
Susan P. Worswick, Royal Greenwich Observatory (United Kingdom)


Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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