Other
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..816c&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 15, 1982, p. 816
Other
36
Bursts, Carbon Monoxide, Color, Schwassmann-Wachmann Comet, Spectrophotometry, Astronomical Photometry, Ice, Mie Scattering, Particle Size Distribution, Solar Flux, Spectral Reflectance, Comets, Spectrophotometry, Schwassmann-Wachmann 1 Comet, Color, Flux, Carbon Monoxide, Emissions, Spectra, Models, Reflectance, Distirbution, Mie Scattering, Theoretical Studies, Particles, Size, Water, Analysis, Carbon Dioxide, Ice, Data, Observations, Data Reduction, Wavelengths
Scientific paper
We obtained spectra of Comet Schwassmann-Wachmann 1 during the winter 1980-1981. On 1981 February 7 UT the comet was in outburst and had a one-armed spiral shape. On that night, spectra of the "nucleus" and of several locations along the arm were obtained. All of the spectra were reduced to relative reflectances. The quiescent state of the comet may be modeled, using Mie scattering theory, by a distribution of relatively large particles with a small variance in particle size. One of the positions observed during outburst showed a spectrum similar to the quiescent state, but the other positions required the addition of a distribution of smaller size particles. As the outburst progressed, more and more of the smaller particles were required. We see no evidence for the particles growing smaller by sublimation as they move outward. The data may be fitted equally well by either H2O or CO2 ice particles.
Our data, plus those of S. Larson and H. Spinrad, also show that the CO+ emission turns on and off on a rapid time scale. We have been able to eliminate the following mechanisms as being correlated with the CO+ or outburst activity: solar phase angle, rotational phase angle, comet-Sun distance, comet-Jupiter distance, and solar activity.
Barker Edwin S.
Cochran Anita L.
Cochran William D.
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