PEPSI: The high-resolution ichelle spectrograph and polarimeter for the Large Binocular Telescope

被引：137

作者：

Strassmeier, K. G. ^{[1
]}

Ilyin, I. ^{[1
]}

Jaervinen, A. ^{[1
]}

Weber, M. ^{[1
]}

Woche, M. ^{[1
]}

Barnes, S. I. ^{[1
]}

Bauer, S. -M. ^{[1
]}

Beckert, E. ^{[2
]}

Bittner, W. ^{[1
]}

Bredthauer, R. ^{[3
]}

Carroll, T. A. ^{[1
]}

Denker, C. ^{[1
]}

Dionies, F. ^{[1
]}

DiVarano, I. ^{[1
]}

Doescher, D. ^{[1
]}

Fechner, T. ^{[1
]}

Feuerstein, D. ^{[1
]}

Granzer, T. ^{[1
]}

Hahn, T. ^{[1
]}

Harnisch, G. ^{[2
]}

Hofmann, A. ^{[1
]}

Lesser, M. ^{[4
]}

Paschke, J. ^{[1
]}

Pankratow, S. ^{[1
]}

Plank, V. ^{[1
]}

Plueschke, D. ^{[1
]}

Popow, E. ^{[1
]}

Sablowski, D. ^{[1
]}

Storm, J. ^{[1
]}

机构：

[1] Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany

[2] Fraunhofer Inst Appl Opt & Precis Engn IOF, D-07745 Jena, Germany

[3] Semicond Technol Associates STA, San Juan Capistrano, CA 92675 USA

[4] Univ Arizona, ITL, Tucson, AZ 85721 USA

来源：

ASTRONOMISCHE NACHRICHTEN | 2015年 / 336卷 / 04期

关键词：

instrumentation: spectrographs; instrumentation: polarimeters; instrumentation: detectors; techniques: spectroscopic; stars:; individual; (HD; 194937; tau Cet alpha Cyg); Sun: photosphere; SPECTROPOLARIMETER; REGION; LBT;

D O I：

10.1002/asna.201512172

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

PEPSI is the bench-mounted, two-arm, fibre-fed and stabilized Potsdam Echelle Polarimetric and Spectroscopic Instrument for the 2x8.4 m Large Binocular Telescope (LBT). Three spectral resolutions of either 43 000, 120 000 or 270 000 can cover the entire optical/red wavelength range from 383 to 907 nm in three exposures. Two 10.3kx10.3k CCDs with 9-mu m pixels and peak quantum efficiencies of 94-96 % record a total of 92 echelle orders. We introduce a new variant of a wave-guide image slicer with 3, 5, and 7 slices and peak efficiencies between 92-96 %. A total of six cross dispersers cover the six wavelength settings of the spectrograph, two of them always simultaneously. These are made of a VPH-grating sandwiched by two prisms. The peak efficiency of the system, including the telescope, is 15 % at 650 nm, and still 11 % and 10 % at 390 nm and 900 nm, respectively. In combination with the 110 m(2) light-collecting capability of the LBT, we expect a limiting magnitude of approximate to 20th mag in V in the low-resolution mode. The R = 120 000 mode can also be used with two, dual-beam Stokes IQUV polarimeters. The 270 000-mode is made possible with the 7-slice image slicer and a 100-mu m fibre through a projected sky aperture of 0.74, comparable to the median seeing of the LBT site. The 43 000-mode with 12-pixel sampling per resolution element is our bad seeing or faint-object mode. Any of the three resolution modes can either be used with sky fibers for simultaneous sky exposures or with light from a stabilized Fabry-Perot etalon for ultra-precise radial velocities. CCD-image processing is performed with the dedicated data-reduction and analysis package PEPSI-S4S. Its full error propagation through all image-processing steps allows an adaptive selection of parameters by using statistical inferences and robust estimators. A solar feed makes use of PEPSI during day time and a 500-m feed from the 1.8 m VATT can be used when the LBT is busy otherwise. In this paper, we present the basic instrument design, its realization, and its characteristics. Some pre-commissioning first-light spectra shall demonstrate the basic functionality. ((c) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

引用

页码：324 / 361

页数：38

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