The nature of dust grains in the comae of Comets Cernis and Bowell

Details The nature of dust grains in the comae of Comets Cernis and Bowell The nature of dust grains in the comae of Comets Cernis and Bowell

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985em%26p...33..179h&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 33, Oct. 1985, p. 179-187.

Astronomy and Astrophysics

Astronomy

4

Astronomical Models, Chemical Composition, Comets, Cosmic Dust, Grain Size, Carbon, Ice, Infrared Spectra, Light Scattering, Organic Compounds, Silicates

Scientific paper

The currently available infrared data on scattered light from the dust comae of Černis and Bowell set stringent upper limits to the contribution of icy grains. For comet Černis the data is consistent with only a 10% mass fraction of water-ice included within silicate-organic-carbon grains of scale radius 15 microns, while for comet Bowell there is no evidence for any ice component. A coma of small (10 - 100 μm) organic grains containing a fraction of OH-bearing molecules that evaporate over weeks at 5 AU and leave an absorptive carbonaceous grain residue is the simplest model for comet Bowell.

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