PEPSI-feed: linking PEPSI to the Vatican Advanced Technology Telescope using a 450m long fibre

Sablowski, D. P.; Weber, M.; Woche, M.; Ilyin, I.; Järvinen, Arto; Strassmeier, K. G.; Gabor, Pavel

doi:10.1117/12.2231874

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The fibers will be illuminated directly by the same OAPs mounted symmetrically with respect to the collimating OAP, similar to the PEPSI-VATT focal station. 4 The calibration light will be fed directly into the focus of the first OAP mirror, using a 200 µm fiber from a calibration unit providing both flat field and ThAr light. All fibers will be of the same type, the Polymicro FBP fiber with 50 µm core diameter and octagonal cross-section.…”

Section: The New Stella-ii Correctormentioning

confidence: 99%

Second generation spectroscopic instrumentation for the STELLA robotic observatory

Weber

Woche

Strassmeier

et al. 2020

Observatory Operations: Strategies, Processes, and Systems VIII

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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&K spectrograph covering 380 nm to 470 nm (SES-H&K), the visual band (470 nm -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 690 nm 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&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.

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Section: The New Stella-ii Correctormentioning

confidence: 99%

Second generation spectroscopic instrumentation for the STELLA robotic observatory

Weber

Woche

Strassmeier

et al. 2020

Observatory Operations: Strategies, Processes, and Systems VIII

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“…Paper I in this series dealt with these spectra. A 450-m fiber feed (Sablowski et al 2016) from the 1.8m VATT was used for very bright stars on several occasions. We note that the VATT spectra consist of just a single target spectrum on the CCD because it is only a single telescope.…”

Section: Observationsmentioning

confidence: 99%

PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards

Strassmeier,

Ilyin,

Weber

2017

Preprint

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Context. High-resolution échelle spectra confine many essential stellar parameters once the data reach a quality appropriate to constrain the various physical processes that form these spectra. Aims. We provide a homogeneous library of high-resolution, high-S/N spectra for 48 bright AFGKM stars, some of them approaching the quality of solar-flux spectra. Our sample includes the northern Gaia benchmark stars, some solar analogs, and some other bright Morgan-Keenan (M-K) spectral standards. Methods. Well-exposed deep spectra were created by average-combining individual exposures. The data-reduction process relies on adaptive selection of parameters by using statistical inference and robust estimators. We employed spectrum synthesis techniques and statistics tools in order to characterize the spectra and give a first quick look at some of the science cases possible.Results. With an average spectral resolution of R ≈ 220, 000 (1.36 km s −1 ), a continuous wavelength coverage from 383 nm to 912 nm, and S/N of between 70:1 for the faintest star in the extreme blue and 6,000:1 for the brightest star in the red, these spectra are now made public for further data mining and analysis. Preliminary results include new stellar parameters for 70 Vir and α Tau, the detection of the rare-earth element dysprosium and the heavy elements uranium, thorium and neodymium in several RGB stars, and the use of the 12 C to 13 C isotope ratio for age-related determinations. We also found Arcturus to exhibit few-percent Ca ii H&K and Hα residual profile changes with respect to the KPNO atlas taken in 1999.

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PEPSI-feed: linking PEPSI to the Vatican Advanced Technology Telescope using a 450m long fibre

Cited by 2 publications

References 9 publications

Second generation spectroscopic instrumentation for the STELLA robotic observatory

Second generation spectroscopic instrumentation for the STELLA robotic observatory

PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards

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