Molecular band polarization in Comet P/Halley

Details Molecular band polarization in Comet P/Halley Molecular band polarization in Comet P/Halley

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217..307s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 307-310. Research supported by the Department of S

Astronomy and Astrophysics

Astrophysics

8

Emission Spectra, Halley'S Comet, Molecular Spectra, Polarized Radiation, Comet Nuclei, Comet Tails, Linear Polarization, Resonance Fluorescence, Comets, Halley, Polarization, Photopolarimetry, Emissions, Fluorescence, Comae, Comet Tails, Wavelengths, Resonance, Parameters, Cn Radical, C3 Radical, C2 Radical, Water, Cyanogen, Carbon Monoxide, Calculations, Theoretical Studies

Scientific paper

Photopolarimetric investigations in the coma and tail region of Comet P/Halley for the molecular emission bands of CN, C3, CO(+), C2 and H2O(+) have been carried out. The wavelength dependence of polarization shows a decrease in polarization across different emission bands where the emission takes place by resonance fluorescence mechanism. Using Stokes parameters, calculations have been done for the resonance fluorescence polarization values in different emission bands. It has been found that emissions from CN, C2 and C3 have polarization values between 5-7 percent (at a phase angle of 66.1 degree). For CN and C2 the polarization values agree well with the theoretically predicted values, but for C3 the polarization value falls much below the theoretically predicted value.

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