Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9460b&link_type=abstract
HST Proposal ID #9460
Other
Hst Proposal Id #9460
Scientific paper
We propose to acquire high resolution ACS H-alpha , [N II] , and [O III] images in four outlying portions of the Orion Nebula that will sample the type of environment in which most members of the Trapezium cluster stars are located. We seek to understand the properties of outflows and protoplanetary disks `proplyds' located more than 4' {0.5 pc} from the core of the Orion Nebula as a function of the radiation field intensity. Two of our target fields contain recently identified externally irradiated jets that suffer large C-shaped bends. The Orion jets are ionized by external UV radiation. Thus, the structures of the target flows can be directly determined from images without recourse to non-linear shock models. High resolution images of their shocks will be used to distinguish between several possible models of jet deflection and to directly compare with 3D numerical models of jets in side- winds. Two other fields contain large proplyd candidates and large numbers of young stars formed from the Orion molecular ridge. These young stars are in less irradiated environments than the well studied proplyds in the nebular core. We will search for new proplyds surrounding these stars to see if the lower radiation field implies a better chance of disk survival. These observations will serve to constrain the properties of protoplanetary disks in lower radiation environments than those in the nebular core.
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