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Scattering Properties of Cometary Dust Based on Polarimetric Data

Published online by Cambridge University Press:  12 April 2016

Sonoyo Mukai ,
Tadashi Mukai  and
Sen Kikuchi
Sonoyo Mukai
Affiliation:
Kanazawa Institute of Technology Nonoichi, Ishikawa 921, Japan
Tadashi Mukai
Affiliation:
Kanazawa Institute of Technology Nonoichi, Ishikawa 921, Japan
Sen Kikuchi
Affiliation:
National Astronomical Observatory Mitaka 181, Japan

Abstract

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Referring to the dust model in Mukai and Mukai(1990), where the scattering by large rough particles and Mie scattering by small particles are taken into account, a phase function of linear polarization of several comets is examined, especially in a region of phase angles α near a maximum polarization. A lower maximum polarization observed in comet Austin(1989c1) than those in comets West(1975n) and P/Halley leads a speculation that a mixing ratio of rough scattering to Mie scattering in comet Austin increases from a sun-comet distance r of 0.6 AU to 1.2 AU. This implies that a shortage of large particles in comet Austin occured in r <1 AU.

Type
Cometary Dust: Observations and Evolution
Information
International Astronomical Union Colloquium , Volume 126: Origin and Evolution of Interplanetary Dust , 1991 , pp. 249 - 252
Copyright
Copyright © Kluwer 1991

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