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MAPPING THE LINEARLY POLARIZED SPECTRAL LINE EMISSION AROUND THE EVOLVED STAR IRC+10216

J. M. Girart ; N. Patel ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; R. Rao
Astrophysical Journal Letters (2041-8205). Vol. 751 (2012), 1,
[Artikel, refereegranskad vetenskaplig]

We present spectro-polarimetric observations of several molecular lines obtained with the Submillimeter Array toward the carbon-rich asymptotic giant branch star IRC+10216. We have detected and mapped the linear polarization of the CO 3-2, SiS 19-18, and CS 7-6 lines. The polarization arises at a distance of similar or equal to 450 AU from the star and is blueshifted with respect to the Stokes I. The SiS 19-18 polarization pattern appears to be consistent with a locally radial magnetic field configuration. However, the CO 3-2 and CS 7-6 line polarization suggests an overall complex magnetic field morphology within the envelope. This work demonstrates the feasibility of using spectro-polarimetric observations to carry out tomographic imaging of the magnetic field in circumstellar envelopes.

Nyckelord: circumstellar matter, polarization, stars: AGB and post-AGB, stars: individual (IRC+10216, CW Leo), magnetic-field direction, circumstellar envelope, sio masers, imaging, polarimetry, radio frequencies, molecular clouds, forming regions, ghz, milliarcsecond, 21(oh)



Denna post skapades 2012-06-11. Senast ändrad 2014-09-02.
CPL Pubid: 158719

 

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