arxiv: 0811.2264 · v2 · pith:ROXTGK3Lnew · submitted 2008-11-14 · 🌌 astro-ph

Astrometry with the Keck-Interferometer: the ASTRA project and its science

Jorg-Uwe Pott , Julien Woillez , Rachel L. Akeson , Ben Berkey , Mark M. Colavita , Andrew Cooper , Josh A. Eisner , Andrea M. Ghez

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James R. Graham Lynne Hillenbrand Michael Hrynewych Drew Medeiros Rafael Millan-Gabet John Monnier Douglas Morrison Tatyana Panteleeva Eliot Quataert Bill Randolph Brett Smith Kellee Summers Kevin Tsubota Colette Tyau Nevin Weinberg Ed Wetherell Peter L. Wizinowich

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keywords astraastrometryinterferometrictechnologyupgradewillacceleratedastrometric

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The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief overview of the underlying interferometric principles, the technology and concepts of the upgrade are presented. The interferometric dual-field technology of ASTRA will provide the KI with the means to observe two objects simultaneously, and measure the distance between them with a precision eventually better than 100 uas. This astrometric functionality of ASTRA will add a unique observing tool to fields of astrophysical research as diverse as exo-planetary kinematics, binary astrometry, and the investigation of stars accelerated by the massive black hole in the center of the Milky Way as discussed in this contribution.

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Astrometry with the Keck-Interferometer: the ASTRA project and its science

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