Other
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt........10c&link_type=abstract
Ph.D. Thesis Arizona Univ., Tucson.
Other
10
Infrared Radiation, Microstructure, Polarimetry, Radiation Sources, Absorption Spectra, Grain Boundaries, Particle Size Distribution, Refractivity, Silicates
Scientific paper
The polarization properties of a class of infrared sources which have apparent 9.7 micron silicate absorption features were investigated using a 10 micron polarimeter. Detailed observations of the Becklin-Neugebauer source (BN), indicate that the linear polarization is produced by absorption in partially aligned, elongate particles. Comparisons of the observations with model calculations demonstrates that the 9.7 micron volume absorption coefficient of the silicate material BN is at least a factor of two smaller than laboratory values of terrestrial silicates. The characteristic size of the particles is much less than 10 microns and the index of refraction has a very small imaginary part near 10 microns. Observations of six other sources imply that the degree of grain alignment around BN is high in comparison to other spectroscopically similar objects.
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