FIES fiber injection upgrade | Zendy

D. Gandolfi | Zendy; Julian Stürmer | Zendy; Andreas Seifahrt | Zendy; Christian Schwab | Zendy; Lars A. Buchhave | Zendy; P. MontañésRodríguez | Zendy

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FIES fiber injection upgrade

Author(s) -

D. Gandolfi,

Julian Stürmer,

Andreas Seifahrt,

Christian Schwab,

Lars A. Buchhave,

P. MontañésRodríguez

Publication year - 2018

Publication title -

ground-based and airborne instrumentation for astronomy vii

Language(s) - English

Resource type - Conference proceedings

DOI - 10.1117/12.2313052

Subject(s) - upgrade , spectrograph , telescope , optics , optical fiber , scrambling , fiber , physics , materials science , computer science , spectral line , astronomy , algorithm , composite material , operating system

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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