Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164..397m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 2, Aug. 1986, p. 397-407.
Astronomy and Astrophysics
Astrophysics
42
Astronomical Models, Cometary Atmospheres, Comets, Ice, Interplanetary Dust, Water, Carbon Dioxide, Crystals, Ethyl Compounds, Temperature Measurement
Scientific paper
An effective-medium theory was applied to obtain average optical constants of composite medium, and consequently the elevated temperature of a heterogeneous icy grain consisting of H2O matrix with absorbing and silicate inclusions has been predicted quantitatively, compared with that of pure water-ice in interplanetary space. Based on such a dirty water-ice model for cometary dust, the observed evidence for Comet Bowell (1980b) is examined, and it is found that an emission of dust with radius s equals about 0.5 mm beyond a comet-sun distance r = 10 AU estimated by Sekanina (1982) is due to the evaporation of volatiles such as CO2 and/or C2H4 from the nucleus; that a computed lifetime of released large dirty ice becomes less than one year at about r = 4-5 AU, which is consistent with a disappearance of original large ice when this comet approaches its perihelion, and that OH production rate by sublimation of amorphous water-ice in the heterogeneous icy grain produces agreement with the observed values (A'Hearn et al., 1984).
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