Near-Infrared Speckle Imaging and AO
Polarimetry of the Bipolar Proto-Planetary Nebula Frosty Leo
Murakawa, K.; Ohnaka, K.; Driebe, T.;
Hofmann, K.-H.; Schertl, D.; Oya, S.; Weigelt, G.
"Why Galaxies Care About AGB Stars: Their
Importance as Actors and Probes"
ASP Conference Series held from August 7-11, 2006 in Vienna, Austria
Vol. 378, pg.321-322(2007)
Abstract
We present a K′–band speckle image and H,K–band polarimetric images of
the oxygen-rich proto-planetary nebula Frosty Leo. Our speckle image
reveals clumpy structures in the hourglass-like bipolar nebula. The
polarimetric data, for the first time, detected an elongated region
with small polarization. We have performed radiative transfer
calculations to investigate the physical properties of the Frosty Leo
nebula. We found that micron-size grains in the dense equatorial region
and small grains in the bipolar lobes are required to explain the total
intensity images, the polarization images, and the spectral energy
distribution.
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