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Proceedings Paper

Opto-mechanical design of the spectrometers of GRAVITY: the 6-Baseline K-Band Interferometer for the VLTI
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Paper Abstract

GRAVITY is a 2nd generation VLTI instrument that operates in the K-band and uses up to 4 telescopes simultaneously. GRAVITY will provide interferometric astrometry of two objects in a 2 arcsecond field of view at an astrometric precision of 10 μas. Using all four UTs and six interferometric baselines, it will allow for phase-referenced imaging at mas resolution in combination with spectroscopic and polarimetric observing capabilities. The large field of view of the VLTI delay lines is worldwide unique on a 140 m baseline, and no other VLTI instrument is taking advantage of that outstanding capability so far. In this paper we present the optical and mechanical design of the two spectrometers of the instrument. The presented design resulted from the successful Phase A study of the system and provides low-resolution spectroscopy using grisms and Wollaston prisms for polarimetry.

Paper Details

Date Published: 28 July 2008
PDF: 9 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 701331 (28 July 2008); doi: 10.1117/12.787549
Show Author Affiliations
Christian Straubmeier, Univ. of Cologne (Germany)
Frank Eisenhauer, Max-Planck-Institute for Extraterrestrial Physics (Germany)
Guy Perrin, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Andreas Eckart, Univ. of Cologne (Germany)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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