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astro-ph2007★ 6 cited
Optically Thick Radio Cores of Narrow-Waist Bipolar Nebulae
T. -H. Lee, J. Lim, S. Kwok
We report our search for optically thick radio cores in sixteen narrow-waist bipolar nebulae. Optically thick cores are a characteristic signature of collimated ionized winds. Elev…
astro-ph2005
Dust Extinction in Compact Planetary Nebulae
T. -H. Lee, S. Kwok
The effects of dust extinction on the departure from axi-symmetry in the morphology of planetary nebulae (PNs) are investigated through a comparison of the radio free-free emission…