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Multi-epoch interferometric observations of the Be star ζ Tau

Published online by Cambridge University Press:  12 July 2011

Gail H. Schaefer ,
Douglas R. Gies ,
John D. Monnier ,
Noel D. Richardson ,
Yamina N. Touhami  and
Ming Zhao
Gail H. Schaefer
Affiliation:
The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA, 91023, U.S.A., email schaefer@chara-array.org
Douglas R. Gies
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302, U.S.A
John D. Monnier
Affiliation:
Department of Astronomy, University of Michigan, Ann Arbor, Michigan 48109, USA
Noel D. Richardson
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302, U.S.A
Yamina N. Touhami
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302, U.S.A
Ming Zhao
Affiliation:
Jet Propulsion Laboratory, Pasadena, California 91101, USA
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Abstract

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We present interferometric observations of the Be star ζ Tau obtained using the MIRC beam combiner at the CHARA Array during four epochs in 2007–2009. Fitting a geometric model to the data reveals a nearly edge-on disk with a FWHM of ~1.8 milli-arcsec in the H-band. The non-zero closure phases indicate an asymmetry in the brightness distribution. Interestingly, when combining our results with previously published interferometric observations of ζ 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 might be 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.

Keywords

techniques: interferometriccircumstellar matterstars: emission-lineBe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 424 - 425
Copyright
Copyright © International Astronomical Union 2011

References

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