Polarimetry of visible and near-UV molecular bands - Comets P/Halley and Hartley-Good

Details Polarimetry of visible and near-UV molecular bands - Comets P/Halley and Hartley-Good Polarimetry of visible and near-UV molecular bands - Comets P/Halley and Hartley-Good

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..180l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 180-182.

Astronomy and Astrophysics

Astronomy

17

Halley'S Comet, Molecular Spectra, Near Ultraviolet Radiation, Polarimetry, Spectral Bands, Visible Spectrum, Cyanogen, Hydroxyl Radicals, Magnetic Fields, Polarization Characteristics, Comets, Halley, Hartley-Good, Polarimetry, Visible Light, Ultraviolet, Wavelengths, Polarization, Comparisons, Theoretical Studies, Astronomy, Fluorescence, Earth-Based Observations, Emissions, Telescope Methods, Cyanide Radical, Hydroxyl Radical, Carbon Radical, Magnetic Fields

Scientific paper

Preliminary results are given on new measurements of the polarization of the violet band of CN (3880 angstroms), the Swan band of C2 (5140 angstroms), and the OH band around 3090 angstroms in comets. The measurements essentially refer to P/Halley with some additional data from comet Hartley-Good. The measurements are compared with the theoretical dependence with phase angle alpha of the fluorescence polarization of the molecular bands. C2 data are in good agreement with this dependent while CN data show some significant deviations. C2 data usually show a polarization perpendicular to the scattering plane. Deviations up to 20 deg are found for the CN band. There is a possible correlation between the deviations of polarization degree and angle for CN but no explanation was found for the observed deviations from the classical fluorescence mechanism for the CN and OH bands.

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