The infrared spectrum of Comet Bradfield (1987s) and the silicate emission feature

Details The infrared spectrum of Comet Bradfield (1987s) and the silicate emission feature The infrared spectrum of Comet Bradfield (1987s) and the silicate emission feature

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..312h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 312-321. Research supported by USAF, NSF, and Univers

Astronomy and Astrophysics

Astrophysics

59

Cometary Atmospheres, Emission Spectra, Infrared Spectra, Silicates, Astronomical Spectroscopy, Interstellar Chemistry, Interstellar Matter, Olivine, Comets, Bradfield, Silicate, Emissions, Infrared, Wavelengths, Spectra, Earth-Based Observations, Dust, Optical Properties, Comparisons, Grains, Production Rate, Thermal History, Hypotheses, Photometry, Particles, Albedo, Perihelion

Scientific paper

Infrared (1-20 microns) observations of Comet Bradfield (1987s) from three observatories are reported. Silicate emission is prominent in all the data, from heliocentric distance r = 0.87 to 1.45 AU. A CVF spectrum at r = 1.45 AU shows a peak at 11.3 microns identified as crystalline olivine; the spectral shape is similar to that in Halley. Dust optical properties are similar to those of the grains in Halley's jets. Dust production rate near perihelion was about 10 to the 6th g/s and varied as N exp-2. It is suggested that some differences in grain properties among comets could result from difference in the thermal history of the nuclear surface and the relative fraction of the dust particles originating in the subsurface icy layer versus the devolatilized mantle.

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