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Astron. Astrophys. 338, L63-L66 (1998)

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Letter to the Editor

CO study of the GM Aurigae Keplerian disk

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

1 Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France
2 Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800, USA
3 Laboratoire d'Astrophysique de Grenoble, B.P. 53, F-38041 Grenoble Cedex 9, France

Received 15 June 1998 / Accepted 25 August 1998


We report new high resolution ([FORMULA]) images of GM Aur in the [FORMULA]  [FORMULA] line and the 1.3 and 2.7 mm continuum. The dust disk, located at the center of the CO disk, is resolved by the [FORMULA] beam of the interferometer. We derive a minimum radius of [FORMULA] AU, and a total mass (dust+gas) of about [FORMULA]. Our CO observations also resolve the Keplerian rotation of the gas disk. Since the CO emission is optically thick, the CO data does not allow a disk mass measurement but we can estimate the dynamical mass of the system, i.e. the stellar mass , [FORMULA] although a solution with a more inclined disk and lower stellar mass ([FORMULA]) is also possible.

Key words: stars: T Tauri – circumstellar matter – pre-main sequence – radio-lines: stars

Send offprint requests to: A.Dutrey

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© European Southern Observatory (ESO) 1998

Online publication: September 14, 1998