24 July 1998 Bootstrapping the NPOI: keeping long baselines in phase by tracking fringes on short baselines
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Proceedings Volume 3350, Astronomical Interferometry; (1998); doi: 10.1117/12.317111
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States
Abstract
The high-spatial-frequency fringes that contain detailed information about a stellar image are generally too weak to track. The Navy Prototype Optical Interferometer (NPOI) is the first interferometer to measure these fringes with the techniques of phase bootstrapping - the use of fringe tracking on two short baselines AB and BC to keep a longer baseline AC phased up - and wavelength bootstrapping - the use of fringe tracking at long wavelengths to keep the long baseline phased up at short wavelengths. We demonstrate the utility of phase and wavelength bootstrapping with the NPOI observations of stellar limb darkening of (beta) Cancri of Pauls et al. in these proceedings. The NPOI baselines and wavelength coverage were 19, 22, and 38 m and (lambda) 450 to (lambda) 850 nm. For (lambda) < 675 nm, the 37 m baseline samples the uv plane beyond the first null of the Airy disk.
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J. Thomas Armstrong, David Mozurkewich, Thomas A. Pauls, Arsen R. Hajian, "Bootstrapping the NPOI: keeping long baselines in phase by tracking fringes on short baselines", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317111; https://doi.org/10.1117/12.317111
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KEYWORDS
Visibility

Interferometers

Aluminum

Signal to noise ratio

Stars

Data modeling

Optical tracking

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