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The implications of close binary stars for star-disk interactions

Published online by Cambridge University Press:  01 May 2007

Robert D. Mathieu
Robert D. Mathieu*
Affiliation:
Department of Astronomy, University of Wisconsin – Madison, WI 53706USA email: [email protected]
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Abstract

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The presence of close (≲ 0.1 AU) stellar companions must greatly alter the circumstellar environment of classical T Tauri stars, including severe truncation if not elimination of circumstellar disks. It is thus remarkable how little impact the presence of a close companion has on our observable diagnostics for accretion and outflow. Emission line shapes, degrees of continuum veiling, and spectral energy distributions are all indistinguishable between single classical T Tauri stars and classical T Tauri close binaries. Some of the most classical T Tauri stars that laid the foundation for our single-star accretion-disk paradigm have turned out to have close companions. Periodicities in spectral signatures are suggestive of the presence of accretion flows from circumbinary disks to the circumstellar regions; the subsequent flow of material through the circumstellar region to the stellar surface in the presence of a stellar magnetosphere is unstudied. Observations of stellar rotation distributions in close binaries suggest that inner disk regions may act to regulate stellar angular momentum.

Keywords

Binary starsaccretion streamsstellar rotationUZ Tau EDQ Tau
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S243: Star-Disk Interaction in Young Stars , May 2007 , pp. 315 - 324
Copyright
Copyright © International Astronomical Union 2007

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