Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..650m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 650-652.
Astronomy and Astrophysics
Astrophysics
49
Halley'S Comet, Interplanetary Dust, Polarimetry, Refractivity, Granular Materials, Wavelengths
Scientific paper
Visible polarimetry of comet Halley over the phase angle α (sun-comet-earth angle) from 1°.6 to 64°.4 has shown negative values of the polarization p in α ≤ 20° and linearly increase of p with α > 20°. In addition, a slight increase of p with wavelength λ is likely to exist. By applying the Mie calculations to explain both α- and λ-dependences of p, the authors have found that it's likely for the cometary dust to consist of the material with the average complex refractive index (m = n-ik), i.e. (n, k) = (1.392, 0.024) at λ = 0.365 μm, (1.387, 0.031) at λ = 0.484 μm, (1.385, 0.035) at λ = 0.62 μm and (1.383, 0.038) at λ = 0.73 μm, for grains assumed to have the size spectrum reported by the Vega missions.
Kikuchi Sen
Mukai Sadaatsu
Mukai Tadashi
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