The Small Scale Structure of Protostellar Disks and Infall Envelopes

Details The Small Scale Structure of Protostellar Disks and Infall Envelopes The Small Scale Structure of Protostellar Disks and Infall Envelopes

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7325t&link_type=abstract

HST Proposal ID #7325

Computer Science

Hst Proposal Id #7325 Young Stars And Circumstellar Material

Scientific paper

HST has provided striking images of circumstellar disks towards young stars, seen silhouetted in absorption against bright nebular backgrounds. The advent of the near-infrared NICMOS camera on HST brings subarcsecond imaging to even younger sources, protostars. The NIR resolution of 0.2'' compares favorably with the expected 1'' disks of nearby protostars. Too heavily extincted for visible wavelength imaging {A_V >= 30}, accreting protostars are nonetheless often bright NIR targets. The small scale structure of their reflection nebulae provides a venue for scattering/absorption studies of the collapsing protostellar envelope and protostellar disk. The NICMOS images, combined with Monte Carlo scattering models will test theories of cloud collapse, constrain protostellar wind models, and delineate the early formation of protostellar disks.

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