Molecular emission from expanding circumstellar envelopes Polarization and profile asymmetries

Details Molecular emission from expanding circumstellar envelopes Polarization and profile asymmetries Molecular emission from expanding circumstellar envelopes Polarization and profile asymmetries

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..107m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. 107-116.

Astronomy and Astrophysics

Astrophysics

56

Infrared Stars, Molecular Spectra, Polarization Characteristics, Radiative Transfer, Radio Stars, Stellar Envelopes, Emission Spectra, Millimeter Waves, Molecular Excitation, Molecular Rotation, Radial Velocity, Self Absorption, Zeeman Effect

Scientific paper

The process of radiation transfer from molecular lines in expanding circumstellar envelopes is examined and a mechanism is proposed for the observed asymmetries in radio line profiles from IRC + 10216. The mechanism is based on the finite size of the emission region at a particular velocity, and on the variation of the excitation temperature across the emitting region. It is shown that the relative alignment of rotational axes of molecules with excited rotational levels is due to the absorption and re-emission of infrared vibration-rotation line photons. The nonuniform distribution of populations along the Zeeman sublevels may occasionally mainfest itself as a polarization of the emergent rotational lines. The polarization intensity for existing large millimeter telescopes is predicted, and is found to be large. Some possible mechanisms for depolarization are discussed, including hyperfine structure, radiative trapping, and magnetic fields.

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