Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.8917l&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #89.17; Bulletin of the American Astronomical Society, Vol. 34, p.1255
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an indirect method to probe the dust distribution in PNe. Using the free-free continuum flux density and Hβ recombination line flux relationship and the theoretical Hα /Hβ line ratio, we determined the expected Hα flux from the radio continuum maps. The dust optical depth distribution of each planetary nebula was then derived from the expected to observed Hα flux ratio. With HST WFPC2 and VLA A-array observations, dust optical depth maps with resolution as high as ~ 0.1 arcsec can be obtained. The radio continuum images, Hα images, and the resultant dust extinction maps were then analyzed in terms of the ellipsoidal shell (ES) model. Simulated radio images are produced using various asymmetry parameters in the ES model. A dust distribution of constant gas-to-dust ratio was given in the model with the same set of asymmetry parameters to simulate the optical and extinction images. These models enable us to remove the projection effects onto the sky, reconstruct the three dimensional dust distribution in planetary nebulae, and make quantitative measures of the intrinsic asymmetries of the nebulae.
Kwok Sun
Lee Ting-Hui
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