Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9863k&link_type=abstract
HST Proposal ID #9863
Physics
Hst Proposal Id #9863 Star Formation
Scientific paper
Our understanding of jet physics, whether at small {young stellar outflows} or large {galactic outflows} scales is reflected by our ability to model the dynamics of the interaction of a jet with its surroundings and itself. These models must be constrained by observations, which have typically shown slow, long-timescale changes. However, a unique opportunity to examine rapidly varying jet dynamics is available with an established history. XZ Tauri and HH 30 represent two substantially different young stellar outflows that have been simultaneously imaged by HST/WFPC2 over 6 epochs spanning 7 years. XZ Tau is a binary T Tauri system in which both stars are jet sources and have somehow created an amazing outflow that has undergone dramatic changes {turn-on of limb brightening, deceleration, interactions with the collimated stellar jets}. In comparison, the textbook protostellar disk of HH 30 emits a well-collimated, knotty bipolar jet, in which motions and knot mergers can be measured over timescales as short as a year. We wish to continue yearly monitoring of this unique field with ACS/WFC, and apply hydrodynamic jet models to reproduce the observations.
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