Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8713m&link_type=abstract
HST Proposal ID #8713
Computer Science
Hst Proposal Id #8713 Ism And Circumstellar Matter
Scientific paper
We propose HAlpha, SII, SIII and R-band WFPC2 imaging of the NGC 281 nebula. This region, which we have studied intensively at near-infrared and radio wavelengths, contains a rich cluster of young, low-mass stars emerging from an edge-on molecular gas/H, ii region interface. With the WFPC2 images, we plan to search for <= 2000 AU sized evaporating globules, or EGGs, similar to those detected in M16 by Hester et al. {1996}. These globules are thought to be accreting envelopes surrounding young protostars. By comparing the proposed WFPC2 imaging with our existing near- infrared {NIR} data, we can estimate the fraction of stars which emerge from the molecular cloud enshrouded in EGGs. The goal is to determine whether most stars in the NGC 281 cluster emerge from the clouds still cloaked in their protostellar envelopes, or whether they disrupt their envelopes prior to emergence. From this analysis, we will ascertain whether photoevaporation by external OB stars plays a significant role in terminating protostellar accretion in young clusters.
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