Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009newar..53..344c&link_type=abstract
New Astronomy Reviews, Volume 53, Issue 11-12, p. 344-352.
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Narrow-angle dual-star interferometric astrometry can provide very high accuracy in the presence of the Earth’s turbulent atmosphere. However, to exploit the high atmospherically-limited accuracy requires control of systematic errors in measurement of the interferometer baseline, internal OPDs, and fringe phase. In addition, as high photometric SNR is required, care must be taken to maximize throughput and coherence to obtain high accuracy on faint stars. This article reviews the key aspects of the dual-star approach and implementation, the main contributors to the systematic error budget, and the coherence terms in the photometric error budget.
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