21 July 2010 Observations of binaries with the NPOI
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Abstract
We present the results of Navy Prototype Optical Interferometer observations of the binary stars θ2 Tauri and HR7955. These data are reduced using standard methods, as well as coherent integration, and were fitted using three different methods to measure the separation and position angle of the components, and their magnitude differences. We used the traditional technique of fitting the V2's, triple amplitudes and triple phases, we also fitted the baseline phases obtained through coherent integration, and measured the separation of the components directly on images reconstructed using complex visibilities and phase self calibration. We find that fitting baseline phases produces the highest precision. The results obtained from imaging are similar to these, although with higher uncertainties, while the traditional method has the lowest precision. We attribute this result to the fact that the traditional method combines multiple measurements, e.g. triple phases, thus increasing the errors and reducing the amount of information that can be fitted. We also obtain a preliminary fit to the orbit of HR7955.
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Henrique R. Schmitt, J. Thomas Armstrong, Anders M. Jorgensen, Ellyn K. Baines, Robert B. Hindsley, "Observations of binaries with the NPOI", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77343G (21 July 2010); doi: 10.1117/12.858307; https://doi.org/10.1117/12.858307
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