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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents ID: 660582.0, MPI für Astronomie / Publikationen_mpia First faint dual-field phase-referenced observations on the Keck Interferometer Authors: Woillez, J.; Wizinowich, P.; Akeson, R.; Colavita, M.; Eisner, J.; Millan-Gabet, R.; Monnier, J.; Pott, J. -. U.; Ragland, S.; Appleby, E.; Cooper, A.; Felizardo, C.; Herstein, J.; Martin, O.; Medeiros, D.; Morrison, D.; Panteleeva, T.; Smith, B.; Summers, K.; Tsubota, K.; Tyau, C.; Wetherell, E. Publisher: SPIE Date of Publication (YYYY-MM-DD): 2012 Title of Proceedings: Optical and Infrared Interferometry III Start Page: id. 84450E-84450E End Page: 10 Volume (in Series): 8445 Name of Conference/Meeting: Optical and Infrared Interferometry III Audience: Not Specified Abstract / Description: Ground-baseed long baselinne interferomeeters have lonng been limiteed in sensitiviity by the shoort integration periods imposed by atmospheric tuurbulence. Thee first observaation fainter thhan this limit wwas performedd on January 222, 2011 when the Keck Interferommeter observedd a K=11.5 taarget, about onne magnitude fainter than iits K=10.3 limmit. This observation wwas made posssible by the Duual Field Phase Referencing instrument of the ASTRA pproject: simultaaneously measuring thhe real-time efffects of the atmmosphere on a nearby bright guide star, andd correcting foor it on the fainnt target, integration tiime longer thaan the turbulennce time scale are made possible. As a preelude to this ddemonstration, we first present the implementatioon of Dual FField Phase RReferencing onn the interferoometer. We tthen detail itss on-sky performance focusing on tthe accuracy oof the turbulennce correction, and on the reesulting fringe contrast stabiility. We conclude witth a presentatioon of early resuults obtained wwith Laser Guidde Star AO andd the interferommeter. Comment of the Author/Creator: Date: 2012, July 1, 2012 External Publication Status: published Document Type: Conference-Paper Communicated by: N. N. Affiliations: MPI für Astronomie Identifiers: URL:http://cdsads.u-strasbg.fr/abs/2012SPIE.8445E..0EW The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.