24 July 2014 Testing limb darkening laws using NPOI observations
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Abstract
We observed 85 stars using the Navy Precision Optical Interferometer in order to determine their angular diameters. Here we present preliminary uniform disk fits for the stars. Many of the targets have measurements through the first zero crossing and onto the second lobe of the visibility curve. We will use these observations to test limb darkening laws, namely the effectiveness of plane parallel versus spherically symmetric models. These results have important implications for the accuracy with which we can determine the limb darkening of stars used as calibrators on long baselines being implemented in the near future on the NPOI, which will almost certainly have to be at least semi-resolved. The validation or exposure of systematics in the limb darkening laws can also be applied to any number of stars observed interferometrically.
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Ellyn K. Baines, Ellyn K. Baines, J. Thomas Armstrong, J. Thomas Armstrong, Henrique R. Schmitt, Henrique R. Schmitt, James Benson, James Benson, Donald J. Hutter, Donald J. Hutter, R. T. Zavala, R. T. Zavala, } "Testing limb darkening laws using NPOI observations", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91460W (24 July 2014); doi: 10.1117/12.2055130; https://doi.org/10.1117/12.2055130
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