Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10289f&link_type=abstract
HST Proposal ID #10289
Physics
Hst Proposal Id #10289 Ism
Scientific paper
HST imaging has revealed many circumstellar environments to consist of highly inhomogeneous media. The presence of such "clumpy" mass distributions will have significant consequences for large-scale flows such as mass loss from young and evolved stars as well as strong shocks propagating through interstellar clouds. While clumping can cause dramatic changes in the properties of such flows there remains a fundemental gap between the relatively few theoretical studies of large scale clumpy flow systems and observational interpretations. In this proposal we outline a theoretical study of clumpy flows in circumstellar outflows using a new, advanced adaptive mesh refinement numerical code known as AstroBEAR. This tool is being developed to handle multi-physics astronomical phenomena {situations in which many physical processes such as magnetic fields, ionization, chemistry, and radiation transport must be simultaneously simulated}. Our study will provide unparalleled resolution to study the radiative gasdynamic, magneto-gasdynamic and photo-ionization evolution of heterogeneous flows. The code will track ionization and micro-physical states in the flow allowing detailed comparison with HST observations of YSO jets and Planetary Nebulae. We plan to apply the code to the observations of clumpy bow shocks and internal working surfaces in HH 1-2, HH34, and HH46/47. We will also conduct studies relevent to the stellar wind blown bubble PNe systems NGC 2392 and NGC 6751.
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