Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8365w&link_type=abstract
HST Proposal ID #8365
Physics
Hst Proposal Id #8365 Stellar Ejecta
Scientific paper
The goal of this proposal is to determine better estimates of some fundamental quantities of the Eta Car Homunculus through modeling of HST imagery. These quantities are: total mass of the emitting gas and dust, and the latitudinal distribution of dust. The total mass is fundamental because it says something about the kinetic energy of the eruption which, based on the current estimates, now sits right up there with the bolometric luminosity of the star. The latitudinal distribution says something about the nature of the initial mass loss mechanism that caused the outburst. To get at these quantities, we will need to model the image morphology confirming the shape of the homunculus and inclination, model the dust scattering properties, and estimate the dust-to-gas ratio. The wavelength coverage provided by the WFPC2 camera will nicely constrain dust models as the large difference in opacities will sample different optical depths. The narrow-band images will be used in conjunction with imaging models to estimate the gas-to-dust ratio. We will use accurate 3-D radiation transfer codes and hydrodynamic codes as our modeling tools.
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