Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6132k&link_type=abstract
HST Proposal ID #6132
Computer Science
Hst Proposal Id #6132 Interstellar Medium
Scientific paper
We propose an imaging program to constrain the initial angular momentum of protostellar cloud cores, the radii of circumstellar disks, and the interaction between the highly- collimated jets and protostellar envelopes of young stellar objects. Our sample spans a range of evolutionary states, from the youngest stars still enshrouded in their parent clouds to older systems where infall has nearly ceased. PC images in an I-band continuum filter will constrain the structure of dusty envelopes outlined in scattered light; S II images will determine the location of the jet relative to the infalling envelope. Our scattering models for ground-based images suggest that optically thick protostellar envelopes have bipolar cavities that allow light from the central star to illuminate a large reflection nebula. HST images will enable us to measure the size and shape of this cavity close to the central star and its surrounding disk. By comparing the degree of jet collimation and the shape of the scattered light cavity on 0sec point1--0sec point2 scales, we will also explore the possibility that jets create the cavities, shape the scattered light nebulae, reverse the infall, and set the final mass of the star. Theoretical models predict that scattered light can be enhanced in a rotating ring, where material from the envelope lands on the outer disk. Detection of these rings in the least-reddened sources of our sample would provide direct measurements of the disk radius and indirect measurements of the initial
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