The Hobby-Eberly Telescope medium resolution spectrograph and fiber instrument feed

Scott D. Horner, Leland G. Engel, Lawrence W. Ramsey

Research output: Contribution to journalConference articlepeer-review

16 Scopus citations


The Medium Resolution Spectrograph (MRS) is a high throughput, versatile, fiber-fed echelle spectrograph for the Hobby-Eberly Telescope (HET). This instrument is designed for a wide range of scientific investigations; it includes single-fiber inputs for the study of point-like sources, synthetic slits of fibers for long slit spectroscopy, multi-fiber inputs for multi-object spectroscopy, and an optical fiber integral field unit. The MRS will have resolution settings between 3500 < λ/Δλ < 21000 and will consist of two beams. The initial, visible wavelength beam will have wavelength coverage from 450-900 nm in a single exposure. This beam will also have capability in the ranges 390-450 and 900-950 nm by altering the angles of the echelle and/or cross-disperser gratings. Later, a second beam operating in the near-infrared will be added which will have coverage of 950-1300 nm in a single exposure and capability out to 1800 nm. The HET Fiber Instrument Feed (FIF) is mounted at the focal plane of the telescope and positions the fibers feeding the MRS and the High Resolution Spectrograph (HRS). The unique and economical design of the FIF enables the HET's versatility in performing a wide range of scientific investigations with the telescope operating in a queue-scheduled mode.

Original languageEnglish (US)
Pages (from-to)399-408
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventOptical Astronomical Instrumentation - Kona, HI, United States
Duration: Mar 26 1998Mar 26 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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