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Title:
SpeX: A Medium-Resolution 0.8-5.5 Micron Spectrograph and Imager for the NASA Infrared Telescope Facility
Authors:
Rayner, J. T.; Toomey, D. W.; Onaka, P. M.; Denault, A. J.; Stahlberger, W. E.; Vacca, W. D.; Cushing, M. C.; Wang, S.
Affiliation:
AA(Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under contract from NASA.), AB(), AC(), AD(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ), AE(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ), AF(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ; Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under contract from NASA.; Currently at the Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Garching, Germany.), AG(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ), AH(University of Chicago Engineering Center, 5640 South Ellis Avenue, Chicago, IL 60637)
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 805, pp. 362-382. (PASP Homepage)
Publication Date:
03/2003
Origin:
UCP
PASP Keywords:
Stars: Hertzsprung-Russell Diagram, Instrumentation: Detectors, Instrumentation: Spectrographs, Stars: Low-Mass, Brown Dwarfs, Stars: Wolf-Rayet
DOI:
10.1086/367745
Bibliographic Code:
2003PASP..115..362R

Abstract

We present the design, construction, and performance of SpeX, a medium-resolution 0.8-5.5 μm cryogenic spectrograph and imager, now in operation at the 3.0 m NASA Infrared Telescope Facility (IRTF) on Mauna Kea. The design uses prism cross-dispersers and gratings to provide resolving powers up to R~2000 simultaneously across 0.8-2.4, 1.9-4.2, or 2.4-5.5 μm, with a 15" long slit. A high-throughput low-resolution R~200 prism mode is also provided for faint-object and occultation spectroscopy. Single-order 60" long-slit modes with resolving powers up to R~2000 are available for extended objects. The spectrograph employs an Aladdin 3 1024×1024 InSb array and uses narrow slits and a spatial scale of 0.15" pixel-1 for optimum sensitivity on point sources. An autonomous infrared slit viewer is used for object acquisition, infrared guiding, and scientific imaging in the wavelength range 0.8-5.5 μm. The imager employs an Aladdin 2 512×512 InSb array that covers a 60''×60'' field of view at 0.12" pixel-1. SpeX was successfully commissioned on IRTF during 2000 May, June, and July. Astronomical observations are presented to illustrate performance.
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