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POLARIMETRY OF INFRARED SOURCES

Published online by Cambridge University Press:  14 August 2015

H. M. Dyck  and
Carol J. Lonsdale
H. M. Dyck
Affiliation:
University of Hawaii, Honolulu, Hawaii 96822
Carol J. Lonsdale
Affiliation:
University of Hawaii, Honolulu, Hawaii 96822

Extract

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Polarization at infrared wavelengths has been detected from a number of different objects within the Galaxy. These include young sources associated with molecular clouds and H II regions, cool stars with thick circumstellar shells, bi-polar nebulae, and normal stars suffering interstellar polarization. Typical levels of polarization detected at 2.2 μm are up to 25% for the molecular cloud sources, less than −5% for the cool stars, around 30% for some bi-polar nebulae and less than −2% for interstellar polarization. For the latter three types of source the origin of the polarization is basically understood: it results from scattering of stellar radiation off small particles in the surrounding shell or nebula in the cool stars and bi-polar nebulae and by transfer of flux through a foreground medium of aligned dust grains for the interstellar polarization. The phenomenon of large infrared polarization in the young stellar and pre-stellar sources is less well understood, and it is to this problem that we address ourselves in this review.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 96: Infrared Astronomy , 1981 , pp. 223 - 236
Copyright
Copyright © Reidel 1981 

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