Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..569c&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 15, 1982, p. 569-575. Research supported by the Research Corp.
Astronomy and Astrophysics
Astrophysics
29
Interstellar Masers, Polarized Radiation, Variable Stars, Emission Spectra, Linear Polarization, Silicon Oxides, Stellar Atmospheres, Velocity Distribution
Scientific paper
The polarization properties of the J = 2-1, v = 1 SiO circumstellar maser emission from R Cas have been measured over a period of nearly 2 years. Velocity profiles for both the Stokes parameter I and the total linear polarization change relatively smoothly but not periodically with time indicating that radiative pumping mechanisms are probably not dominant in this source. Superposed on these smoothly varying profiles, a phase dependent effect at phi = 0.96 has been detected for two successive optical maxima. This phase dependent effect, most readily observed in polarized radiation, places the SiO just above the stellar photosphere and allows the radial thickness of the line formation region to be estimated. The detection of a 'superbroad' spectral feature of width approximately 18 km/s is reported.
Clark Frank O.
Johnson Richard D.
Troland Thomas H.
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