Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9825b&link_type=abstract
HST Proposal ID #9825
Computer Science
Hst Proposal Id #9825 Star Formation
Scientific paper
We propose to survey nearly 500 square arcminutes of the Orion Nebula in H-alpha using the ACS/WFC, increasing the sky coverage by an order of magnitude over the sum of all previous HST observations. This survey will, for the first time, sample the majority of young stars and circumstellar environments in the extended Trapezium cluster of 2, 000 low-mass stars. Our primary goal is to determine the survival rate and statistical properties of protoplanetary disks in the type of radiation field and dynamical environment in which most stars are born. The survey will be used to search for new silhouette disks, bright proplyds, microjets, large-scale outflows, and to characterize the properties of these objects as a function of location in the nebula. We will determine accurate proper motions in regions where previous HST data exist. However, 90% of our fields will be observed with HST for the first time. This survey will provide the first complete census of pre-main sequence objects and outflows in an HII region and will constrain the extent of hazards to planet formation in such environments. The images will also provide a legacy for future stellar and nebular variability studies and proper motion measurements by providing a first epoch data base.
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