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The current STELLA Echelle spectrograph (SES), which records 390nm to 870nmin one shot at a spectral resolution of 55000, will be replaced by a suite ofspecialized spectrographs in three spectral bands. The UV will be covered by anewly designed H&K spectrograph covering 380nm to 470nm (SES-H&K), the visualband (470nm - 690nm) will be covered by SES-VIS, which is a vacuum-stabilizedspectrograph designed for high radial-velocity accuracy, and the NIR will becovered by the current SES spectrograph from 690nm to 1050nm. In order toimprove the UV transmission, and to accommodate three different fibre-feeds,the prime focus corrector of the telescope will be refurbished, leading to anoptical system with the f/2 1200mm spherical primary, a 4-lens collimator with2 arcsec aperture, atmospheric dispersion corrector (ADC), and two dichroicbeam splitters, feeding 3 separate fibre feeds for the three bands. The newlydesigned H&K spectrograph will be an Echelle spectrograph, based on aR4-grating with 41.6 l/mm and 110mmx420mm, using a f/5 camera and thecross-disperser in double pass (as in TRAFICOS, MIKE, KPF), using 21 spectralorders. The spectral resolution of all three spectrographs will be comparableto the 55000 of the current SES.

Second generation spectroscopic instrumentation for the STELLA robotic observatory