Other
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..195w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 195-200.
Other
54
Infrared Stars, Interstellar Masers, Linear Polarization, Molecular Excitation, Radiative Transfer, Stellar Envelopes, Anisotropy, Giant Stars, Late Stars, Silicon Oxides, Stellar Radiation, Vibrational Spectra
Scientific paper
In view of the present solution of transfer equations propagating in more than one direction, small excitation anisotropies may result in linear polarization values as high as 90 percent of the radiation from even the saturated astronomical masers. Separate calculations for the transfer, including polarization, of the vibrational radiation of molecular SiO through a spherical gas shell quantitatively illustrate that anisotropic excitation is probable for circumstellar SiO masers. Results also indicate that the stellar continuum radiation through fundamental transitions is sufficient to power the SiO masers associated with late-type giants. The high linear polarization of circumstellar SiO astronomical masers may therefore be due to a mechanism other than magnetic fields.
Watson William D.
Western L. R.
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