Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5504r&link_type=abstract
HST Proposal ID #5504
Computer Science
Hst Proposal Id #5504 Interstellar Medium Hh Objects
Scientific paper
Herbig-Haro jets have in recent years been subject to intense study, and it is now clear that they are an integral part of the star formation process and provide insights into the very earliest stages of stellar evolution. We propose to study two of the finest known HH jets, HH 111 and HH 47, using HST with WFPC2 and interference filters. Analytical and numerical models of HH jets have reached a high degree of sophistication, but further progress is blocked until it is established whether the observed structure of jets is formed through Kelvin-Helmholtz instabilities or time-variability in the wind from the driving source. The two competing models make definite predictions about the morphology and excitation pattern within the jet knots which can be tested with high resolution interference filter images. The very best ground-based images taken in 0.6"-0.7" seeing and deconvolved to 0.4" show tantalizing structure, but not definite enough to firmly choose between the two models. Only HST observations can provide the required resolution.
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