FIES fiber injection upgrade

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

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution


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 publicationGround-based and Airborne Instrumentation for Astronomy VII
EditorsChristopher J. Evans, Luc Simard, Hideki Takami
Place of PublicationBellingham, Washington
Number of pages5
ISBN (Electronic)9781510619586
ISBN (Print)9781510619579
Publication statusPublished - 6 Jul 2018
EventGround-based and Airborne Instrumentation for Astronomy VII 2018 - Austin, United States
Duration: 10 Jun 201814 Jun 2018

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceGround-based and Airborne Instrumentation for Astronomy VII 2018
CountryUnited States


  • optical fibers
  • radial velocity
  • FIES
  • echelle
  • spectrograph

Cite this

Stürmer, J., Seifahrt, A., Schwab, C., Gandolfi, D., Montañes-Rodriguez, P., & Buchhave, L. (2018). FIES fiber injection upgrade. In C. J. Evans, L. Simard, & H. Takami (Eds.), Ground-based and Airborne Instrumentation for Astronomy VII (Vol. 10702, pp. 1-5). [107022S] (Proceedings of SPIE; Vol. 10702). Bellingham, Washington: SPIE.