Millimeter-wave spectropolarimetry of evolved stars: Evidence for polarized molecular line emission

Jason Glenn, Christopher K. Walker, John H. Bieging, P. R. Jewell

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We present spectropolarimetry of CSJ = 2-1 emission from the evolved stars IRC +10216 and CRL 2688 and spectropolarimetry of the HCN J = 1-0 transition from CRL 2688. We detected a line-averaged linear polarization of ∼1% toward IRC +10216 on three separate occasions. We found no evidence for velocity dependence of the polarization within the emission line. A deviation from spherical symmetry in the radiative transfer of the envelope is implied because polarization was detected toward the central star. The polarization position angle of about -70° is orthogonal to the envelope elongation apparent in previous observations. Polarizations of 5.1% ± 1.5% (1 σ) and less than 0.9% (3 σ), respectively, were derived for CS and HCN from CRL 2688.

Original languageEnglish (US)
Pages (from-to)L89-L92
JournalAstrophysical Journal
Issue number1 PART II
StatePublished - 1997


  • Circumstellar matter
  • Polarization
  • Stars: AGB and post-AGB

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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