Statistics – Computation
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..i501b&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #I5.01
Statistics
Computation
Scientific paper
The evolution of gaseous nebular hydrodynamics in astrophysics interests everyone studying star formation, stellar winds and ejecta, shocks assoicated with supernovae and other explosive events, outflows from black holes and neutron stars, and active galactic nuclei. However, even the closest nebulae cannot be studied on size scales of a mean free path, typically 10^15.5 cm, from the ground. Entire generations of models have been computed ``in the dark'' without recourse to observational feedback and evaluation. [0.1cm] The Hubble Space Telescope with its corrected optics is providing exciting new images which are helping to verify many of the model computations, sharpening others, and overturning all sorts of expectations. In this talk I shall describe the immense changes occurring in radiation hydrodynamics through a brief ``tour'' of HST images of planetary nebulae (like these and these) - a particulary bright, nearby, simple, and well-studied class of objects formed as dying stars shed and then wind-sculpt and photoionize their former envelopes into nebulae of strikingly complex symmetries and morphology. A review of the physical processes believed to affect the state and flow variables of these astrophyscial nebulae will also be introduced.
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