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Proceedings Paper

LRS2: a new low-resolution spectrograph for the Hobby-Eberly Telescope
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Paper Abstract

In the era of the Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU), the current Low-Resolution Spectrograph (LRS) will be replaced with a more capable red-optimized fiber instrument, called LRS2. This new spectrograph will be based on the Visible Integral-field Replicable Unit Spectrograph (VIRUS) that was designed to be easily adapted to a wide range of spectral resolutions, and wavelength ranges. The current snapshot of LRS2, fed by a 7x12 sq. arcsec fiber integral-field unit (IFU), covers 350-1100 nm, simultaneously at a fixed resolving power R~1800, with the wavelength range split into two pairs of spectrographs, one for the blue to red wavelength range (350-630 nm) and the other for the red and far-red range (630-1100 nm). These units are designated LRS2-B and LRS2-R, respectively. Only minimal modification from the base VIRUS design in gratings (for both pairs) and in the detector (for the red pair only) is required. In addition to this flexibility, the generic nature and massively replicable characteristic of the instrument can allow us to adapt the instrument to a wide range of not only telescope diameters (1 m ~ 40 m), but also observing modes (single to multiple objects). We discuss the current snapshot of the LRS2 design.

Paper Details

Date Published: 21 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357H (21 July 2010); doi: 10.1117/12.857201
Show Author Affiliations
Hanshin Lee, McDonald Observatory, The Univ. of Texas at Austin (United States)
Taylor S. Chonis, The Univ. of Texas at Austin (United States)
Gary J. Hill, McDonald Observatory, The Univ. of Texas at Austin (United States)
Darren L. DePoy, Texas A&M Univ. (United States)
Jennifer L. Marshall, Texas A&M Univ. (United States)
Brian Vattiat, McDonald Observatory, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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