期刊
ASTRONOMICAL JOURNAL
卷 140, 期 6, 页码 1838-1849出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/140/6/1838
关键词
circumstellar matter; stars: emission-line, Be; stars: individual (zeta Tau); techniques: interferometric
资金
- National Science Foundation [AST-0606861, AST-0352723, AST-0707927, AST-0807577, AST-0606958, AST-0908253]
- University of Michigan
- NASA [NNH09AK731]
- GSU College of Arts and Sciences
- W.M. Keck Foundation
- NASA Exoplanet Science Institute
- David and Lucile Packard Foundation
- Georgia State University
- Direct For Mathematical & Physical Scien [0807577] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0807577] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009080] Funding Source: National Science Foundation
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 an FWHM major axis of similar to 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.
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