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Astron. Astrophys. 343, L61-L64 (1999)

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Letter to the Editor

Forbidden lines from T Tauri disk winds

I. High magnetic torque models

S. Cabrit 1, J. Ferreira 2 and A.C. Raga 3

1 Observatoire de Paris, DEMIRM, URA 336 du CNRS, 61 Avenue de l'Observatoire, F-75014 Paris, France
2 Laboratoire d'Astrophysique de l' Observatoire de Grenoble, B.P. 53, F-38041 Grenoble Cedex, France
3 Instituto de Astronomía, UNAM, Ap. 70-264, 04510 D.F. México

Received 20 October 1998 / Accepted 3 February 1999


We present synthetic emission maps and long-slit spectra in the [O I ]6300 and [S II ]6731 lines for self-similar, cold MHD disk winds of high magnetic torque. We find that such models produce both a dense, compact low-velocity component (LVC) and a lower density, collimated high-velocity component (HVC) sharing several observed properties of jets from T Tauri stars (resolved transverse sizes, strong apparent acceleration in [O I ], larger spatial displacement and lower gradients in [S II ]). Hence, the LVC and HVC observed in TTS might be formed in two distinct regions of the same wind. We suggest that disk wind models with lower ratio of magnetic to viscous torque and significant coronal heating at the wind base could compare even more favorably with the observations.

Key words: accretion, accretion disks – line: profiles – Magnetohydrodynamics (MHD) – stars: pre-main sequence – ISM: jets and outflows

Send offprint requests to: sylvie.cabrit@obspm.fr

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999