Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-04
Proceedings of the SPIE vol 4008, March 2000
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, replaced figures with gifs
Scientific paper
The Echelle Spectrograph and Imager (ESI) is a multipurpose instrument which has been delivered by the Instrument Development Laboratory of Lick Observatory for use at the Cassegrain focus of the Keck II telescope. ESI saw first light on August 29, 1999. The optical performance of the instrument has been measured using artificial calibration sources and starlight. Measurements of the average image FWHM in echelle mode are 22 microns (0.22 arcseconds), 16 to 18 microns (0.16 to 0.18 arcseconds) in broad band imaging mode, and comparable in the low-dispersion prismatic mode (LDP). Images on the sky, under best seeing conditions show FWHM sizes of 34 microns (0.34 arcseconds). Maximum efficiencies are measured to be 30% for echelle and anticipated to be greater than 38% for low dispersion prismatic mode including atmospheric, telescope and detector losses. In this paper we describe the instrument and its specifications. We discuss the testing that led to the above conclusions.
Bolte Michael
Miller Jason J.
Sheinis Andrew I.
Sutin Brian
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