Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..694b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 694-702.
Astronomy and Astrophysics
Astrophysics
41
Interstellar Masers, Linear Polarization, Polarimetry, Electron Transitions, Radiant Flux Density, Silicon Oxides
Scientific paper
Linear polarization has been measured in up to four SiO maser transitions for seven sources, including the Orion maser source associated with IRc2. Polarization variability characteristics are reported for some sources which were observed several times over a 6 month period in the v = 1, J = 2-1 transition. Stars with low envelope expansion velocities appear to have more highly polarized masers than those with high expansion velocities. Comparison of polarization of individual maser features in different transitions indicates that emission from the same rotational transition in different vibrational states often arises in the same volume of gas, but that masers of different rotational transitions within the same vibrational state arise in different regions. For a given source, the profile-averaged fractional polarizations show a uniformity between different transitions, while the profile-averaged position angles do not in general appear to be correlated between transitions.
Barvainis Richard
Predmore Read C.
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