Consequences of spectrograph illumination for the accuracy of radial-velocimetry

  title={Consequences of spectrograph illumination for the accuracy of radial-velocimetry},
  author={Isabelle Boisse and François Bouchy and B. Chazelas and Sandrine Perruchot and Francesco A. Pepe and Christophe Lovis and Guillaume H{\'e}brard},
  journal={arXiv: Instrumentation and Methods for Astrophysics},
For fiber-fed spectrographs with a stable external waveleng th source, scrambling properties of opti- cal fibers and, homogeneity and stability of the instrument i llumination are important for the accuracy of radial- velocimetry. Optical cylindric fibers are known to have good azimuthal scrambling. In contrast, the radial one is not perfect. In order to improve the scrambling ability of the fiber and to stabilize the illumination, optical double scrambler are usually coupled to the fibers… 

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