ESI, a New Keck Observatory Echellette Spectrograph and Imager | Zendy

Andrew Sheinis | Zendy; M. Bolte | Zendy; Harland W. Epps | Zendy; Robert I. Kibrick | Zendy; J. S. Miller | Zendy; Matthew V. Radovan | Zendy; Bruce C. Bigelow | Zendy; Brian M. Sutin | Zendy

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ESI, a New Keck Observatory Echellette Spectrograph and Imager

Author(s) -

Andrew Sheinis,

M. Bolte,

Harland W. Epps,

Robert I. Kibrick,

J. S. Miller,

Matthew V. Radovan,

Bruce C. Bigelow,

Brian M. Sutin

Publication year - 2002

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/341706

Subject(s) - spectrograph , observatory , physics , telescope , cassegrain reflector , optics , sky , first light , field of view , detector , remote sensing , very large telescope , astronomy , light source , stars , geology , spectral line

The Echellette Spectrograph and Imager (ESI) is a multipurpose instrumentwhich has been delivered by the Instrument Development Laboratory of LickObservatory for use at the Cassegrain focus of the Keck II telescope. ESI sawfirst light on August 29, 1999. ESI is a multi-mode instrument that enables theobserver to seamlessly switch between three modes during an observation. Thethree modes of ESI are: An R=13,000-echellette mode; Low-dispersion prismaticmode; Direct imaging mode. ESI contains a unique flexure compensation systemwhich reduces the small instrument flexure to negligible proportions.Long-exposure images on the sky show FWHM spot diameters of 34 microns (0.34")averaged over the entire field of view. These are the best non-AO images takenin the visible at Keck Observatory to date. Maximum efficiencies are measuredto be 28% for the echellette mode and greater than 41% for low-dispersionprismatic mode including atmospheric, telescope and detector losses. In thispaper we describe the instrument and its development. We also discuss theperformance-testing and some observational results.Comment: 10 pages, 14 figures, 8tables, accepted for publication in PASP, 15 April 200

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