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The High-Resolution Cross-Dispersed Echelle White-Pupil Spectrometer of the McDonald Observatory 2.7-m Telescope

Robert G. Tull, Phillip J. MacQueen, Christopher Sneden and David L. Lambert
Publications of the Astronomical Society of the Pacific
Vol. 107, No. 709 (1995 March), pp. 251-264
Stable URL: http://www.jstor.org/stable/40680530
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The High-Resolution Cross-Dispersed Echelle White-Pupil Spectrometer of the McDonald Observatory 2.7-m Telescope
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Abstract

A new high-resolution cross-dispersed echelle spectrometer has been installed at the coudé focus of the McDonald Observatory 2.7-m telescope. Its primary goal was simultaneously to gather spectra over as much of the spectral range 3400 Å to 1 µm as practical, at a resolution R = λ/Δλ ~ 60.000 with signal-to-noise ratio of ~ 100 for stars down to magnitude 11, using 1-h exposures. In the instrument as built, two exposures are all that are needed to cover the full range. Featuring a white-pupil design, fused silica prism cross disperser, and folded Schmidt camera with a Tektronix 2048 X 2048 CCD used at either of two foci, it has been in regularly scheduled operation since 1992 April. Design details and performance are described.

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