Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7311m&link_type=abstract
HST Proposal ID #7311
Mathematics
Logic
Hst Proposal Id #7311 Young Stars And Circumstellar Material
Scientific paper
We propose to investigate the complex small-scale {<= 1''} dynamical and morphological structure of the collimated outflow from the classical T Tauri {cTTS} star DG Tau using spectroscopic imaging in HAlpha and all of its strong red forbidden emission lines. Seven overlapping slit positions, parallel to the outflow but with appropriate offsets in the transverse direction, will be used to provide 2-D intensity and radial velocity data on the high velocity component {HVC or jet component} and the low velocity {LVC} component of the outflow. With this single, but very suitable, target we wish to attack a number of fundamental questions, generic to outflows from all young stars: 1. What is the nature of the enigmatic LVC observed in the forbidden emission lines of cTTSs? This component is spatially much more compact than the jet component {offset typically 0.1''-0.4'' from the star} and represents only partially ionized gas which is flowing 10 times slower than the jet. Understanding the origin of this component will have enormous consequences for models of magneto-centrifugally driven outflows, since hints for broadening of this component by rotation have already been found in ground-based data. 2. What is the spatial intensity, velocity and excitation structure of these flows on 0.1''-2'' scales, e.g. is there evidence for entrainment and velocity variations? 3. What does the transverse velocity profile of a stellar jet look like? Is there evidence, close to the star, for a boundary layer in the jet? 4. On what scales are jets from young stars collimated?
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