Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724206j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #242.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We will present three stellar diameters measurements in which we use coherent integration of data from the Navy Prototype Optical Interferometer. Coherent integration is a post-processing technique which corrects for atmospheric optical-path-difference shifts in interferometric data and allows, effectively, to increase the integration time of optical interferometric data indefinitely by summing many short exposures suitably shifted. This is significant because coherent integration, which allows the complex visibilities to be summed in phase, greatly improves the signal-to-noise ratio over traditional techniques which average squared visibilities. The improvement is particularly dramatic for faint targets, and/or when the visibility amplitude is very small. This is important when measuring stellar diameters on resolving baselines that include visibility nulls. Those baselines best constrain the diameters. However in order to take full advantage of the null as a diameter measure it is necessary to obtain high-SNR measurements around the null, which is possible with coherent integration. We will present observations of three stars for which coherent integration has been used to measure the visibility near the null very precisely. We will then fit these visibilities to uniform disk and limb-darkened visibility models to obtain extremely high precision diameters (1:500 to 1:1000) and limb-darkening parameters.
Armstrong Thomas J.
Baines Ellyn K.
Brown Malcolm
Curtis B.
Hall Tim
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