Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..604j&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 604-611.
Astronomy and Astrophysics
Astronomy
37
Infrared Astronomy, Interstellar Matter, Molecular Clouds, Near Infrared Radiation, Polarized Electromagnetic Radiation, Absorption Spectra, Cosmic Dust, Ice, Infrared Spectra, Metal Oxides, Spectrophotometry
Scientific paper
2-4 micron spectrophotometry of polarized compact infrared sources associated with dense molecular clouds has been obtained. Deep ice absorption bands at 3.1 micron appear in the most highly polarized sources, whereas shallow absorption bands predominate in the weakly polarized objects. These observations suggest that the presence of ice grains may be a necessary condition for strong polarization in young OB stars embedded in molecular clouds. If the observed infrared polarization is produced by magnetically aligned core-mantle grains having a weakly ferromagnetic metallic oxide core and an ice mantle, rather than by paramagnetic silicate grains, the magnetic field strengths required to align the grains may be 5-10 times weaker than fields previously derived for the Orion Molecular Cloud.
Joyce Richard R.
Simon Theodore
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