AAS 204th Meeting, June 2004
Session 82 Star Formation and Early Results from Spitzer
Oral, Thursday, June 3, 2004, 10:00-11:30am, 603/605/607

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[82.07] Adaptive Optics Spectroscopy of Young Stellar Jets : DG Tau, HL Tau, and RW Aur

T. -S. Pyo, M. Hayashi (Subaru Telescope, USA), N. Kobayashi (IoA, Japan), A. T. Tokunaga (IfA, USA), H. Terada, H. Takami, N. Takato, S. S. Hayashi, T. Usuda, T. Yamashita, K. Nedachi (Subaru Telescope, USA), Y. Hayano, Y. Kamata, M. Iye (NAOJ, Japan), W. Gaessler (MPIA, Germany)

We present results of the high angular resolution spectroscopy with the near infrared [Fe II] \lambda1.644 \mum emission line toward the outflows emanating from DG Tau, HL Tau, and RW Aur using the Adaptive Optics System of Subaru Telescope. We resolved the region within ~140 AU (< 1'') in the vicinity of their driving sources with an angular resolution of upto 0.''16. We detected two distinct velocity components separated in space and velocity from all the objects. The high velocity component (HVC) shows the radial velocities |V| > 250 km s-1 and is extended, while the low velocity component (LVC) has the radial velocities of 80 < |V| <150 km s-1 and is located at or near the driving sources. These velocities are consistent with the interpretation that the HVC is launched from the stellar surfaces or their vicinities, while the LVC is accelerated near the inner edges of accreting disks. We also detected redshifted counter outflows for all three objects. While the redshifted outflow of RW Aur is detected within 0.''1 from the star, DG Tau and HL Tau show gaps of ~ 0.''7 (~ 100 AU) occulted by their circumstellar disks. HL Tau and RW Aur show asymmetries in velocities between their blueshifted and redshifted outflows within 1'' and 0.''1, respectively, from the stars. We have demonstrated that the [Fe II] spectroscopy at high spatial and velocity resolutions is a powerful tool to study the outflow mechanisms from young stellar objects especially with large extinctions.

The author(s) of this abstract have provided an email address for comments about the abstract: pyo@subaru.naoj.org

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