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Paper detail

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

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.

preprint2008arXivOpen access
Jorg-Uwe PottJulien WoillezRachel L. AkesonBen BerkeyMark M. ColavitaAndrew CooperJosh A. EisnerAndrea M. GhezJames R. GrahamLynne HillenbrandMichael HrynewychDrew MedeirosRafael Millan-GabetJohn MonnierDouglas MorrisonTatyana PanteleevaEliot QuataertBill RandolphBrett SmithKellee SummersKevin TsubotaColette TyauNevin WeinbergEd WetherellPeter L. Wizinowich
astro-ph
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Jorg-Uwe PottJulien WoillezRachel L. AkesonBen BerkeyMark M. ColavitaAndrew CooperJosh A. EisnerAndrea M. GhezJames R. GrahamLynne HillenbrandMichael HrynewychDrew MedeirosRafael Millan-GabetJohn MonnierDouglas MorrisonTatyana PanteleevaEliot QuataertBill RandolphBrett SmithKellee SummersKevin TsubotaColette TyauNevin WeinbergEd WetherellPeter L. Wizinowich

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