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NIR high-resolution imaging and radiative transfer modeling of the Frosty Leo nebula

Published online by Cambridge University Press:  15 December 2006

K. Murakawa ,
K. Ohnaka ,
T. Driebe ,
K.-H. Hofmann ,
D. Schertl ,
S. Oya  and
G. Weigelt
K. Murakawa
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
K. Ohnaka
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
T. Driebe
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
K.-H. Hofmann
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
D. Schertl
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
S. Oya
Affiliation:
Subaru telescope, 650 North A'ohoku Place, Hilo, HI 96720, USA
G. Weigelt
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: murakawa@mpifr-bonn.mpg.de
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Abstract

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We present a $K\prime$-band speckle image and $HK$-band polarimetric images of the proto-planetary nebula Frosty Leo obtained using the 6 m SAO telescope and the 8 m Subaru telescope, respectively. Our speckle image revealed clumpy structures in the hourglass-like bipolar nebula. The polarimetric data, for the first time, detected an elongated region with small polarizations and polarization vector alignment on the east side of the central star. We have performed radiative transfer calculations to model the dust shell of Frosty Leo. We found that micron-size grains in the equatorial dense region and small grains in the bipolar lobes are required to explain the total intensity images, the polarization images, and the spectral energy distribution.

Keywords

speckle imagingpolarimetryradiative transfer modelingFrosty LeoPPN
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 473 - 474
Copyright
© 2006 International Astronomical Union