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1 Introduction

The specification and operation of the Kitt Peak coudé spectrograph are described in this manual, intended for use by visiting astronomers and Kitt Peak support staff. Instructions and software for CCD setup and use as well as the auxillary feed telescope are included. Observers are cautioned not to attempt any of the adjustments described herein without prior approval of KPNO staff.

The coudé spectrograph is a versatile instrument capable of intermediate to high resolution (~ 3.6 Å -- 20 mÅ) over a wide range of wavelengths (3000 Å -- 16,000 Å). This manual discusses only the use of CCD systems on the coude spectrograph. While in principle photographic plates could still be used, it has been several years since their last use. Near infra-red wavelengths can presently be accessed with the NICMASS camera, a 256 x 256 HgCdTe array installed at the camera 5 focus. The March, 1995 NOAO Newsletter (Number 41) contains more details on the use of this camera.

The spectrograph is presently used only with the 0.9 m coudé feed telescope.

An instrument assistant is normally present on the first day and evening of an observer's run to help set up and focus the spectrograph.

Guiding of the star on the slit may be done automatically with the ICCD viewing TV and digital memory.