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Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5469b&link_type=abstract
HST Proposal ID #5469
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Hst Proposal Id #5469 Interstellar Medium Circumstellar Matter
Scientific paper
We propose to use HST to study low-mass young stellar objects (YSOs) embedded in the Orion Nebula HII region. Radio, infrared, optical, and X-ray observations have identified a category of compact high density objects containing stellar cores. These objects are believed to be recently formed low mass stars that have become exposed by the intense UV radiation field of the hot stars responsible for excitation of the HII region. We propose to target 3 disk/YSO systems, identified from recent HST observations, for detailed high-resolution imaging and low-resolution spectroscopy. Since these objects are externally illuminated by the light of nearby massive stars, they provide a unique opportunity to investigate the structure and kinematics of the circumstellar environment of a YSO at optical and UV wavelengths. Our data will be used to search for evidence of boundary layer accretion onto the YSO, to search for structure in the protoplanetary disk, and to investigate the nature of the externally induced disk ablation flow. The high spatial and spectral resolution of HST may lead to insights into the formation of proto-planetary disks, the birth of planets, and other Solar-system type objects. We will use parallel observations with WFPC2 to serendipitously search for Herbig-Haro objects and visible YSO/disks in the surrounding Orion molecular cloud.
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