Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-21
Astronomy and Astrophysics
Astrophysics
SPIE 2008 Astronomical telescopes and instrumentation
Scientific paper
10.1117/12.790305
In this paper we will discuss the current status of coherent integration with the Navy Prototype Optical Interferometer (NPOI) (Armstrong et al. 2008). Coherent integration relies on being able to phase reference interferometric measurements, which in turn relies on making measurements at multiple wavelengths. We first discuss the generalized group-delay approach, then the meaning of the resulting complex visibilities and then demonstrate how coherent integration can be used to perform very precision measurement of stellar properties. For example, we demonstrate how we can measure the diameter of a star to a precision of one part in 350, and measure properties of binary stars. The complex phase is particularly attractive as a data product because it is not biased in the same way as visibility amplitudes.
Armstrong Thomas J.
Hindsley Robert
Hutter Donald J.
Jorgensen Anders Moller
Mozurkewich Dave
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