Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7013e..93s&link_type=abstract
Optical and Infrared Interferometry. Edited by Schöller, Markus; Danchi, William C.; Delplancke, Françoise. Proceedings of the
Other
2
Scientific paper
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.
Brandner Wolfgang
Eckart Andreas
Eisenhauer Frank
Perrin Guy
Straubmeier Christian
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