Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357l..61d&link_type=abstract
Astronomy and Astrophysics, v.357, p.L61-L64 (2000)
Astronomy and Astrophysics
Astrophysics
98
Stars: Pre-Main Sequence, Stars: Mass-Loss, Stars: Individual: Cw Tau, Dg Tau, Rw Aur, Stars: Emission-Line, Be, Ism: Individual Objects: Hh 158, Hh 220, Hh 229, Ism: Jets And Outflows
Scientific paper
Using adaptive optics techniques, we have obtained the first [O i] and [S ii] images at 0.1'' sec ( =~ 15 AU) resolution of the jets in CW Tau, DG Tau and RW Aur. In all three jets, the emission is dominated by knots and is resolved transversally down to 56 AU with similar inner jet widths of 0.2-0.25'' sec. The RW Aur and CW Tau jets are straight, their FWHM slowly increasing with distance with opening angles of =~ 3-4°. In contrast, the DG Tau jet seems to be precessing and its FWHM reaches 1.3'' sec at 335 AU, where contamination by strong bow-shock wings most likely occurs. The widths of the CW Tau and RW Aur jets are strikingly similar to those measured in HH 30 and HL Tau, two active TTs, on similar spatial scales. The derived upper limit on the density collimation size scale of =~ 50 AU and intrinsic jet widths of =~ 30 AU over the central 100 AU are in quantitative agreement with predictions from current MHD wind models. In DG Tau we confirm the bow-shaped morphology and detect a high proper motion (194 km s-1) for the knot located at 3.3'' sec. The properties of this knot strongly support the model of internal working surfaces produced by variable ejection. Based on observations collected at the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique, and University of Hawaii.
Cabrit Silvie
Dougados Catherine
Lavalley Claudia
Menard Franccois
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