Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..506z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 506-514.
Astronomy and Astrophysics
Astronomy
13
Circular Polarization, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Late Stars, Radio Sources (Astronomy), Hydroxyl Radicals, Polarized Light, Radio Telescopes, Stellar Magnetic Fields, Stokes Law Of Radiation
Scientific paper
In order to study the incidence of circular polarization in the 1612 MHz OH emission from envelopes of OH/IR stars, the Arecibo radio telescope was used to obtain high-resolution, high signal-to-noise 1612 MHz spectra in both circular polarizations for several OH/IR stars. The method of Troland and Heiles (1982) was used to estimate the intensities of magnetic fields in the envelopes. The fields appear to have complex structures, and intensities on the order of 1-100 microG. The spectra are weakly polarized, probably as a result of weakly polarized emission from individual emitting elements. Integration over the Stokes parameter V yields nonzero results for three of the stars, suggesting that another polarizing mechanism (in addition to simple Zeeman splittings) is at work.
Fix John D.
Zell Philip
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