Infrared Pumping and Polarization of Molecular Lines in IRC+10216

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

In a circumstellar environment, the central star provides a source of radiation that is anisotropic at any point in the envelope. Observationally the vibrationally excited, circumstellar SiO masers are known to be quite linearly polarized and close to the star - a phenomenon that can be understood as due to the stellar radiation (Western and Watson 1983). Here, the author considers polarization that is produced in the ground vibrational state emission as a result of infrared excitations in the circumstellar gas due to the star light. As a specific example, the SiO molecule is treated.

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