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Letter to the Editor
DG Tau: A shocking jet *
C. Lavalley-Fouquet 1,
S. Cabrit 2 and
C. Dougados 1,3
Received 15 February 2000 / Accepted 26 February 2000
We present spectro-imaging observations of DG Tau at 0.5" resolution obtained with OASIS in [O I ]6300, H, [N II ]6583, and [S II ]6716,6731. The fast jet core appears wiggling and surrounded by a slower moving flow or cavity. Line ratios are compared with available predictions for heating mechanisms in T Tauri jets (shocks, ambipolar diffusion, turbulent mixing-layers). Shocks with speeds 50-100 km s-1 increasing with flow velocity, and preshock densities - cm-3 decreasing away from the star, are best able to reproduce the high level of excitation for velocities 100 km s-1.
Key words: shock waves stars: individual: stars: pre-main sequence ISM: jets and outflows
* Based on observations collected at the Canada-France-Hawaii Telescope (CFHT), operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique, and University of Hawaii.
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Online publication: April 10, 2000