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27 April 2024

» arxiv » 1009.5425

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Multi-epoch Near-Infrared Interferometry of the Spatially Resolved Disk Around the Be Star Zeta Tau
G. H. Schaefer ; D. R. Gies ; J. D. Monnier ; N. Richardson ; Y. Touhami ; M. Zhao ; X. Che ; E. Pedretti ; N. Thureau ; T. ten Brummelaar ; H. A. McAlister ; S. T. Ridgway ; J. Sturmann ; L. Sturmann ; N. H. Turner ; C. D. Farrington ; P. J. Goldfinger ;
Date:	28 Sep 2010
Abstract:	We present interferometric observations of the Be star Zeta Tau obtained using the MIRC beam combiner at the CHARA Array. We resolved the disk during four epochs in 2007-2009. We fit the data with a geometric model to characterize the circumstellar disk as a skewed elliptical Gaussian and the central Be star as a uniform disk. The visibilities reveal a nearly edge-on disk with a FWHM major axis of ~ 1.8 mas in the H-band. The non-zero closure phases indicate an asymmetry within the disk. Interestingly, when combining our results with previously published interferometric observations of Zeta Tau, we find a correlation between the position angle of the disk and the spectroscopic V/R ratio, suggesting that the tilt of the disk is precessing. This work is part of a multi-year monitoring campaign to investigate the development and outward motion of asymmetric structures in the disks of Be stars.
Source:	arXiv, 1009.5425
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