TRAFICOS - AN ECHELLE ZEEMAN SPECTROGRAPH

We describe the TRAnsportable FIbre COupled echelle Spectrograph (TRAF ICOS) equipped with a Zeeman analyzer and manufactured mainly for the observation of stellar magnetic fields. The spectrograph, designed at the Astrophysikalisches Institut Potsdam and constructed at the Thurin ger Landessternwarte Tautenburg, is laid out in a quasi-Littrow config uration. The part attached to the Nasmyth focus of the 2 m telescope c ontains the telescope adapter for the fibre input and output of the st ar and calibration light, the cases for the flatfield and the waveleng th calibration, and the Zeeman analyzer. The optical scheme and the re duction software are mentioned in some details and the first results o f the determination of the magnetic field and radial velocity of sever al stars are given showing the performance of the device in comparison with existing data.