Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..529r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 529-543. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
26
Infrared Astronomy Satellite, Infrared Radiation, Stellar Luminosity, Stellar Models, Zodiacal Light, Interplanetary Medium, Solar System, Zodiacal Dust, Interplanetary Dust, Emissions, Postion (Location), Brightness, Models, Astronomy, Zodiacal Light, Iras Satellite, Satellite Observations, Dust, Radiation, Infrared, Latitude, Density Gradient, Theoretical Studies, Symmetry, Earth, Zodiacal Dust, Geometry, Calculations, Comparisons, Diagrams, Albedo, Procedure, Distance, Temperature
Scientific paper
The location and brightness of the peak zodiacal emission are derived from IRAS observations of the diffuse infrared background radiation. A uniform ellipsoid geometrical model is fitted to the latitudes of peak brightness, from which the orientation of the surface of maximum dust density near the earth's orbit is derived. Deviations from the uniform ellipsoid indicate that this surface bends toward the invariable plane of the solar system beyond 2.5 AU from the sun. The variations of the peak zodiacal emission brightness with solar elongation and observation date allow two independent determinations of the gradient of the volume emissivity of interplanetary dust. Combined with theoretical calculations of the infrared emission from silicate and graphite grains heated by the sun, the gradient of the dust density is found to be n proportional to r exp (-1.1 + or - 0.2). Systematic brightness variations with ecliptic longitude reveal two potential asymmetries in the dust complex: excess emission following the earth in its orbit, and excess emission along lines of sight with ecliptic longitude lambda = 190 + or - 20 deg and solar lambda about 100 deg.
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