FIES fiber injection upgrade

Julian Stürmer, Andreas Seifahrt, Christian Schwab, Davide Gandolfi, Pilar Montanés Rodriguez, Lars Buchhave

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We report on the upgrade of the fiber link of FIES, the high-resolution echelle spectrograph at the Nordic Optical Telescope (NOT). In order to improve the radial velocity (RV) stability of FIES, we replaced the circular fibers by octagonal and rectangular ones to utilize their superior scrambling performance. Two additional fibers for a planned polarimetry mode were added during the upgrade. The injection optics and the telescope front-end were also replaced. The first on-sky RV measurements indicate that the influence of guiding errors is greatly suppressed, and the overall RV precision of FIES has significantly improved.
Original languageEnglish
Title of host publicationProceedings of SPIE 10702 - Ground-based and Airborne Instrumentation for Astronomy VII
Editors Christopher J. Evans, Luc Simard, Hideki Takami
Number of pages5
PublisherSPIE - International Society for Optical Engineering
Publication date2018
Article number107022S
ISBN (Print)9781510619517
Publication statusPublished - 2018
EventSPIE Astronomical Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray - Austin, United States
Duration: 10 Jun 201815 Jun 2018


ConferenceSPIE Astronomical Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
CountryUnited States
Sponsor4D Technology Corporation, Andor Technology, Ltd., Astronomical Consultants and Equipment, Inc., Giant Magellan Telescope, SPIE


  • Optical fibers
  • Radial velocity
  • FIES
  • Echelle
  • Spectrograph

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