Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5472r&link_type=abstract
HST Proposal ID #5472
Physics
Hst Proposal Id #5472 Interstellar Medium Hh Objects
Scientific paper
It is over ten years since the discovery of young stellar object (YSO) jets. Although clearly there is an association between these jets and YSO disks, their collimation mechanism is poorly understood. Moreover while radiative shocks are known to be the source of their emission, the origin of these shocks is uncertain. To address these problems, we propose to study the outflows in the vicinity of HL Tau, particularly the jets associated with HL Tau itself. With these images it should be possible to test, for the first time, two rival scenarios for the origin of the jet emission (oblique shocks versus internal working surfaces). We have found that jet opening angles visibly decrease with distance from their source. This argues strongly for models in which external pressure gradients (over scales less than several hundred AU) confine the jet. We wish now to examine the importance of such gradients even closer to the source (i.e. within a few arcseconds) to see whether they are the primary focussing mechanism. Our HST observations will obtain as a byproduct unprecedented information on the circumstellar environs of HL Tau, a YSO which is thought to possess a protoplanetary disk. The study will be carried out using the [SII]6717,6731, H ALPHA, [OI]6300 and F547M filters. This proposal was initially accepted for Cycle 1 but not retained after reassessment.
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