Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9424s&link_type=abstract
HST Proposal ID #9424
Other
Hst Proposal Id #9424
Scientific paper
HST imaging of the Orion M42 H II region has revealed circumstellar emission and absorption regions {``proplyds''} with sizes comparable to those expected for protoplanetary disks. Disk morphology is directly observed in a dozen cases; disk photoevaporation is now the working model to explain the ionized rims seen at more than 100 Trapezium cluster stars. Are the Trapezium circumstances unique? Different cluster ages, densities, and UV radiation fields may strongly affect proplyd characteristics. To address these questions, we have searched for proplyds in several other young nebulous clusters, and found that the embedded infrared cluster associated with the NGC 2024 H II region has a large group of strong proplyd candidates. Our WFPC2 images of the optically visible edge of the cluster have identified an HAlpha proplyd aligned toward a B0 star. Our VLA 3.6 cm maps show compact ionization regions coincident with 20 members of the infrared cluster - a result similar to the original VLA proplyd discovery in M42 by Churchwell {1987}. These results strongly indicate that infrared emission line imaging of selected cluster members should reveal many objects similar to the those in M42. We propose NIC2 Paschen Alpha and continuum imaging of fourteen of the NGC 2024 compact VLA sources. Our goal is to resolve and characterize their circumstellar structures, and compare them with those seen in M42.
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