Linear polarization of HCN maser emission in CIT 6

Details Linear polarization of HCN maser emission in CIT 6 Linear polarization of HCN maser emission in CIT 6

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..873g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 873-879.

Astronomy and Astrophysics

Astrophysics

6

Carbon Stars, Hcn Lasers, Interstellar Masers, Linear Polarization, Stellar Envelopes, Emission Spectra, Ground State, Hydroxyl Radicals, Silicon Oxides, Water

Scientific paper

The authors have measured the linear polarization of the intense emission from vibrationally excited HCN in the circumstellar envelope of the carbon star CIT 6. On several days in 1987 March and April, the J = 1-0 transition of the (0.2°, 0) state was observed. The authors found the emission to have a fractional linear polarization of 20% at a position angle of -18°, with no significant variation in percentage or angle across the line profile. The ground vibrational state line was found to be unpolarized. The strong polarization of the vibrationally excited line confirms that maser amplification, previously suggested by its narrow width and relatively high intensity, is present. The observed polarization could be produced either by anisotropic pumping or by the magnetic field in the envelope of CIT 6.

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