Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..158w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 158-173.
Astronomy and Astrophysics
Astrophysics
51
Interstellar Masers, Linear Polarization, Stellar Magnetic Fields, Anisotropic Media, Magnetic Effects, Magnetic Stars, Numerical Integration, Stellar Envelopes
Scientific paper
A one-dimensional analysis is performed of several possible physical mechanisms causing observed polarization in astronomical masers driven by magnetic fields. Attention is focused on SiO masers in late-type giants. Minimum radiative intensities and magnetic field strengths are calculated by integrating the fractional linear polarization of the maser radiation. Conditions under which fractional polarization will occur are delineated. Integrations are carried out for both J = 1 yields 0 and J = 2 yields 1 transitions transfer equations. When compared with observational data, magnetic fields alone are eliminated as the sole cause of the J = 2 yields 1 transition of circumstellar SiO masers. Magnetic fields alone, however, are capable of producing 1/3 polarization. The highest polarizations observed require the presence of anisotropic pumping.
Watson William D.
Western L. R.
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