DG Tau: A shocking jet

Details DG Tau: A shocking jet DG Tau: A shocking jet

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356l..41l&link_type=abstract

Astronomy and Astrophysics, v.356, p.L41-L44 (2000)

Astronomy and Astrophysics

Astrophysics

94

Shock Waves, Stars: Individual:, Stars: Pre-Main Sequence, Ism: Jets And Outflows

Scientific paper

We present spectro-imaging observations of DG Tau at 0.5'' resolution obtained with OASIS in [O I]lambda 6300, Hα , [N II]LA, and [S II]doublet. 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 105-103 cm-3 decreasing away from the star, are best able to reproduce the high level of excitation for velocities > 100 km s-1. 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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