First Resolved Images of the Eclipsing and Interacting Binary Beta Lyrae - AstrophysicsReport as inadecuate

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Abstract: We present the first resolved images of the eclipsing binary Beta Lyrae,obtained with the CHARA Array interferometer and the MIRC combiner in the Hband. The images clearly show the mass donor and the thick disk surrounding themass gainer at all six epochs of observation. The donor is brighter andgenerally appears elongated in the images, the first direct detection ofphotospheric tidal distortion due to Roche-lobe filling. We also confirmexpectations that the disk component is more elongated than the donor and isrelatively fainter at this wavelength. Image analysis and model fitting foreach epoch were used for calculating the first astrometric orbital solution forBeta Lyrae, yielding precise values for the orbital inclination and positionangle. The derived semi-ma jor axis also allows us to estimate the distance ofBeta Lyrae; however, systematic differences between the models and the imageslimit the accuracy of our distance estimate to about 15%. To address theseissues, we will need a more physical, self-consistent model to account for allepochs as well as the multi-wavelength information from the eclipsing lightcurves.

Author: M. Zhao 1, D. Gies 2, J. D. Monnier 1, N. Thureau 3, E. Pedretti 3, F. Baron 4, A. Merand 2, T. ten Brummelaar 2, H. McAlister 2,


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