Substances of cometary grains estimated from evaporation and radiation pressure mechanisms

Details Substances of cometary grains estimated from evaporation and radiation pressure mechanisms Substances of cometary grains estimated from evaporation and radiation pressure mechanisms

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..351s&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

12

Comets, Grains, Interplanetary Dust, Radiation Pressure, Solar Radiation, Chemical Composition, Comet Tails, Graphite, Particle Size Distribution, West Comet, Comets, Grains, Evaporation, Radiation, Pressure, Shape, Intensity, Distribution, Comet Tails, Data, Gravity Effects, Graphite, Composition, Silicates, Procedure, West Comet, Catalogs, Parameter, Fragmentation, Striae, Mrkos Comet, Ikeya-Seki Comet, Seki-Lines Comet, Sun Grazers

Scientific paper

Estimates of the shape and intensity distribution of large cometary tails on the basis of grain properties in the solar radiation field yields the following results: (1) the ratio of maximum radiation pressure force to the gravitational force acting on dust grains in cometary tails is less than 2.5, implying that such grains as graphite particles in the size range 0.02-0.2 microns do not exist in them; and (2) tail substances supplied near the time of perihelion passage for comets Ikeya-Seki and Seki-Lines were composed of grains having radiation pressure ratio values lower than 1.0. It is concluded that the material was composed of silicate grain only, since iron grains had sublimated and no graphite particles existed.

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