Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7381r&link_type=abstract
HST Proposal ID #7381
Physics
Hst Proposal Id #7381 Young Stars And Circumstellar Material
Scientific paper
We propose to use WFPC2 to observe a remarkable group of small globules discovered by Thackeray in the southern HII region IC 2944. These globules are unique because they lie almost exactly on the line of sight from the ionizing OB cluster to the earth, and hence are seen starkly silhouetted against the HII region. Small globules like these are believed to be remnant molecular cores left behind when an HII region expands eating into the surrounding molecular cloud. Thus in IC 2944 we are witnessing the ultimate fate of structures like the elephant trunks in M 16 recently studied by Hester et al. {1996} Our detailed groundbased study of Thackeray's globules shows that they are fragmented on scales all the way down to the resolution limit. Three processes appear to be responsible for the ongoing destruction of these globules: evaporation, ablation and fragmentation. Of these, only evaporation is reasonably well understood. Thanks to the fortuitous geometry, imaging these globules with HST through an H-Alpha filter will enable us to obtain, for the first time, detailed observational information on the fragmentation and ablation processes.
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