Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9909a&link_type=abstract
HST Proposal ID #9909
Physics
Hst Proposal Id #9909 Hot Stars
Scientific paper
We propose to combine the complementary information obtained from HST {WFPC2 and NICMOS} archival images and OVRO millimeter array observations of protostars to obtain the best information available on the physical and dynamical properties of infalling circumstellar envelopes and the outflow-envelope interaction. The HST images of protostellar nebulae probe the dust component of the envelope, and are the best tracers of the geometry of the cavities in the envelope down to regions very close to the central source. Interferometric molecular line observations probe the gas component, which constitutes most of the mass, and provide kinematic information that directly reflects the energetics and directions of the outflows, and the distribution of the infalling gas. The information provided by these two sets of data will be analyzed consistently with scattered light models of protostellar envelopes of different geometries in which cavities due to infall and/or winds with different morphologies and strength have been carved. Only by combining the HST and OVRO data we can obtain the {unprecedented} information essential to understanding the star formation process.
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