Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..496s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 496-502. Research supported by Department of Space o
Astronomy and Astrophysics
Astronomy
20
Halley'S Comet, Interplanetary Dust, Polarimetry, Astronomical Spectroscopy, Grain Size, Polarization Characteristics, Comets, Dust, Halley, Polarimetry, Astronomy, Polarization, Models, Wavelengths, Grain Size, Refractive Index, Earth-Based Observations, Optical Properties, Procedure, Distribution, Scattering
Scientific paper
Comet P/Halley was observed polarimetrically for seven nights in IHW and other continuum filters, during its pre- and postpreihelion passages. These polarimetric observations have been combined with the observations taken by other investigators to get a complete picture of phase angle and wavelength dependence of polarization of Comet P/Halley. Assuming Mie-type scattering by cometary grains, observed polarization data have been fitted for different complex values of refractive indices of cometary grains. It has been found that a power-law grain size distribution, suggested by Mazets et al. (1987), with grain size spectrum from 0.001 to 20 microns, fits into the observed data, and the refractive indices of the grains are different at different values of the incident wavelength.
Deshpande M. R.
Joshi Umesh C.
Kameswara Rao N.
Raveendran A. V.
Sen Asok Kumar
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