Physico-chemical phenomena in comets-IV . The C2 emission of comet Burnham (1960 II)

Details Physico-chemical phenomena in comets-IV . The C2 emission of comet Burnham (1960 II) Physico-chemical phenomena in comets-IV . The C2 emission of comet Burnham (1960 II)

Oct 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971p%26ss...19.1259d&link_type=abstract

Planetary and Space Science, Volume 19, Issue 10, p. 1259-1274.

Physics

10

Scientific paper

The new model of the cometary head proposed in papers I-III is developed to explain the photometric profiles of the molecular emission bands observed in comets. The model assumes that the icy grains, present in a halo around the nucleus, vaporize `emitters' isotropically at a thermal speed. The `emitters' can be, either the free radicals observed in the spectra, or precursor molecules if their lifetime is much shorter than 104 sec. The observed deviations from the point source model can then be understood as coming only from the presence of a halo of icy grains, acting as an extended source of emitters around the nucleus. The smodel, used to explain the photometric profile of C2 in comet Bumham (1960 II) points to the existence of a halo of icy grains of the same approximate size as independently deduced in paper III from the shape of comet Burnham's continuum.

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