Complex refractive index of grain material deduced from the visible polarimetry of comet P/Halley

  • T. Mukai
  • S. Mukai
  • S. Kikuchi
Conference paper

Summary

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, we have found that it’s likely for the cometary dust to consist of the material with the average complex refractive index (m = n − i• k), 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.

Key words

complex refractive index of grain material cometary dust comet Halley 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bastien, P., Menard, F., Nadeau, R: 1986, Monthly Notices Roy Astron. Soc. 223, 827ADSGoogle Scholar
  2. Brooke, T.Y., Knacke, R.F., Joyce, R.R.: 1986, 20th ESLAB Symp., ESA SP-250, Vol. II, 87Google Scholar
  3. Campins, H., Hanner, M.S.: 1982, in Comets, ed. L.L. Wilkening, Univ. Arizona Press, p. 341Google Scholar
  4. Dobrovolsky, O.V., Kiselev, N.N., Chernova, G.P.: 1986, Earth, Moon, Planets 34, 189ADSCrossRefGoogle Scholar
  5. Dollfus, A., Suchail, J-L., Crussaire, D., Killinger, R.: 1986, 20th ESLAB Symp., ESA SP-250, Vol. II, 41Google Scholar
  6. Giese, R.H.: 1980, in Solid Particles in the Solar System, eds. I. Halliday, B.A. McIntosh, D. Reidel, p. 1Google Scholar
  7. Isobe, S., Saito, K., Tomita, K., Maehara, H.: 1978, Publ. Astron. Soc. Japan 30, 687ADSGoogle Scholar
  8. Kikuchi, S., Mikami, Y., Mukai, T., Mukai, S., Hough, J.H.: 1987 (in preparation)Google Scholar
  9. Kiselev., N.N., Pushnin, P.A., Siklitsky, V.I., Chernova, G.P.: 1986, 20th ESLAB Symp., ESA SP-250, Vol. III, 29Google Scholar
  10. Lamy, P.L.: 1986, in Asteroids, Comets, Meteors II, eds. C.-I. Lagerkvist, B.A. Lindblad, H. Lundstedt, H. Rickman, Uppsala Univ., Uppsala, p. 373Google Scholar
  11. Le Borgne, J.F., Leroy, J.L., Arnaud, J.: 1986, 20th ESLAB Symp., ESA SP-250, Vol. I, 571Google Scholar
  12. Mazets, E.P., Aptekar, R.L., Golenetskii, S.V., Guryan, Y.A., Dyachkov, A.V., Ilyinskii, V.N., Panov, V.N., Petrov, G.G., Savvin, A.V., Sagdeev, R.Z., Sokolov, I.A., Khavenson, N.G., Shapiro, V.D., Shevchenko, V.I.: 1986, Nature 321, 276ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • T. Mukai
    • 1
  • S. Mukai
    • 1
  • S. Kikuchi
    • 2
  1. 1.Kanazawa Institute of TechnologyNonoichi, Ishikawa 921Japan
  2. 2.Tokyo Astronomical ObservatoryMitaka, Tokyo 181Japan

Personalised recommendations