Second generation spectroscopic instrumentation for the STELLA robotic observatory

Michael Weber; Manfred Woche; Klaus G. Strassmeier; Ilya Ilyin; Arto Järvinen

doi:10.1117/12.2562368

13 December 2020 Second generation spectroscopic instrumentation for the STELLA robotic observatory

Michael Weber, Manfred Woche, Klaus G. Strassmeier, Ilya Ilyin, Arto Järvinen

Proceedings Volume 11449, Observatory Operations: Strategies, Processes, and Systems VIII; 114490J (2020) https://doi.org/10.1117/12.2562368
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The current STELLA Échelle spectrograph (SES), which records 390nm to 870nm in one shot at a spectral resolution of 55000, will be replaced by a suite of specialized spectrographs in three spectral bands. The UV will be covered by a newly designed H and K spectrograph covering 380nm to 470nm (SES-H and K), the visual band (470nm - 690 nm) will be covered by SES-VIS, which is a vacuum-stabilized spectrograph designed for high radial-velocity accuracy, and the NIR will be covered by the current SES spectrograph from 690nm to 1050 nm. In order to improve the UV transmission, and to accommodate three different fibre-feeds, the prime focus corrector of the telescope will be refurbished, leading to an optical system with the f/2 1200mm spherical primary, a 4-lens collimator with 2" aperture, atmospheric dispersion corrector (ADC), and two dichroic beam splitters, feeding 3 separate fibre feeds for the three bands. The newly designed H and K spectrograph will be an Échelle spectrograph, based on a R4-grating with 41.6 l/mm and 110mmx420mm, using a f/5 camera and the cross-disperser in double pass (as in TRAFICOS, MIKE, KPF), using 21 spectral orders. The spectral resolution of all three spectrographs will be comparable to the current SES's 55000.

Conference Presentation

Citation Download Citation

Michael Weber, Manfred Woche, Klaus G. Strassmeier, Ilya Ilyin, and Arto Järvinen "Second generation spectroscopic instrumentation for the STELLA robotic observatory", Proc. SPIE 11449, Observatory Operations: Strategies, Processes, and Systems VIII, 114490J (13 December 2020); https://doi.org/10.1117/12.2562368

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