PEPSI, the High-Resolution Optical-IR Spectrograph for the LBT

Abstract

PEPSI is a high resolution fibre feed optical-IR polarimetric echellespectrograph for the Large Binocular Telescope (LBT). PEPSI utilizes thetwo 8.4m LBT apertures to simultaneously record four polarization statesat a resolution of 120.000. The extension of the coverage towards the IRis mainly motivated by the larger Zeeman splitting of IR lines, whichwould allow to study weaker/fainter magnetic structures on stars. Thetwo optical arms, which also have an integral light mode with R up to300.000, are under construction, while the IR arm is being designed.