Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11179h&link_type=abstract
HST Proposal ID #11179. Cycle 16
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
We propose to reobserve three stellar jets in order to quantify how rapidly clumps in these flows accelerate and decelerate, and to compare the results with ongoing numerical simulations and laboratory experiments. Each jet has been imaged twice before with HST, and precise proper motions have been measured for all emitting knots in the jets. Images from the first two epochs show clear differential motions between adjacent clumps, as well as shear, and possibly fragmentation. The proposed third epoch will enable us to measure the first ever accelerations in jets, quantify errors in existing proper motion measurements, and observe in real time how fluid instabilities develop in supersonic flows. The new images will make it possible to compare the behavior of astrophysical flows directly with numerical simulations and with laboratory experiments of bow shocks and clumpy flows in progress at the Omega laser facility.;
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