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Astron. Astrophys. 332, 867-874 (1998)


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Disks in the UY Aurigae binary

G. Duvert 1, A. Dutrey 2, S. Guilloteau 2, F. Ménard 1, K. Schuster 2, L. Prato 3 and M. Simon 3

1 Laboratoire d'Astrophysique de Grenoble, B.P. 53X, F-38041 Grenoble Cedex, France
2 Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France
3 Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794 3800, USA

Received 15 September 1997 / Accepted 7 January 1998

Abstract

We report interferometric images of the UY Aur binary in [FORMULA] [FORMULA] and [FORMULA] which reveal evidence for a large ([FORMULA]) circumbinary disk around the two pre-main-sequence stars. This is the second detection of a circumbinary disk around T Tauri stars. A Keplerian rotation curve around a central mass of [FORMULA] 1.2 [FORMULA] provides a good fit to the velocity data. However, [FORMULA] emission at a systemic velocity close to the binary limits the accuracy of our disk model and a precise assessment of the disk mass. This emission could be related to the "streamers" imaged with adaptive optics around UY Aur. The continuum emission detected at the location of the binary can be attributed to partially resolved circumstellar disks around each star, with some possible contribution of free-free emission.

Key words: stars: individual: UY Aur – binaries: close – circumstellar matter – stars: pre-main sequence – radiolines: stars

Send offprint requests to: G. Duvert

© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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