HIRES: A High Resolution Echelle Spectrometer for the Keck 10-Meter Telescope
HIRES: A High Resolution Echelle Spectrometer for the Keck 10-Meter Telescope
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HIRES：用于 Keck 10 米望远镜的高分辨率阶梯光谱仪
DOI：
10.1007/978-1-4612-3880-5_8
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
G. Penrod
中科院分区：
文献类型：
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作者：
S. Vogt;G. Penrod
我们讨论了目前Keck TMT高分辨率光谱仪(HIRES)的设计。该仪器是一个位于Nasmyth焦点的交叉分散的格栅梯形。束流大小为12“，梯形为新掌握的46.5gr/mm 12”x16“R-2.6回声的1x3马赛克，产生(分辨率×狭缝宽度)乘积R S=39000”。最终，将有多达7种不同的交叉分散剂可用，尽管只有几种在黎明时可用。每个交叉分散器将是12个“x16”栅格的2x1马赛克。将有两个摄像头，一个是分辨率高达5万的短焦距相机，另一个是分辨率高达20万的长焦相机。使用Tektronix 2048x2048摄像头和短摄像头，可以实现约3800-6850A的完整波长覆盖，订单之间的最小间隔为5.0英寸。使用不同的交叉分散器，也可以获得更大的阶数间隔和更有限的波长覆盖范围，用于需要精确的天空减去或扩展源的长缝光谱的项目。利用光纤，可以一次观测多达100个单级物体，或多个级数和光栅交叉色散的10-20个物体。讨论了推动设计的科学和经济因素。
We discuss the present design for the Keck TMT High Resolution Spectrometer (HIRES). The instrument is a grating cross-dispersed echelle located at the Nasmyth focus. The beam size will be 12″, and the echelle will be a 1x3 mosaic of newly-mastered 46.5 gr/mm 12″ xl6″ R-2.6 echelles, yielding a (resolution × slit width) product of R S = 39000″. Eventually, up to 7 different cross-dispersers will be available, though only a few will be available at first light. Each cross-disperser will be a 2x1 mosaic of 12″ xl6″ gratings. There will be two cameras, a short-focus camera for resolutions up to 50,000 and a long camera for resolutions up to 200,000. With a Tektronix 2048x2048 CCD and the short camera, complete wavelength coverage can be achieved from about 3800-6850A, with a minimum of 5.0″ between orders. With different cross-dispersers, larger order separation with more limited wavelength coverage can also be obtained, for projects requiring accurate sky subtraction or longslit spectroscopy of extended sources. With optical fibers, up to 100 objects can be observed at once in a single echelle order, or 10–20 objects with multiple orders and grating cross dispersion. Scientific and economic factors driving the design are discussed.