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6 July 2018 FIES fiber injection upgrade
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Abstract
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.
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Julian Stürmer, Andreas Seifahrt, Christian Schwab, Davide Gandolfi, Pilar Montañes-Rodriguez, and Lars Buchhave "FIES fiber injection upgrade", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022S (6 July 2018); doi: 10.1117/12.2313052; https://doi.org/10.1117/12.2313052
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