Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487l..89g&link_type=abstract
Astrophysical Journal Letters v.487, p.L89
Astronomy and Astrophysics
Astronomy
8
Polarization, Stars: Individual Alphanumeric: Irc +10216, Stars: Individual Alphanumeric: Crl 2688, Stars: Agb And Post-Agb, Stars: Circumstellar Matter
Scientific paper
We present spectropolarimetry of CS J = 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 deg is orthogonal to the envelope elongation apparent in previous observations. Polarizations of 5.1% +/- 1.5% (1 sigma ) and less than 0.9% (3 sigma ), respectively, were derived for CS and HCN from CRL 2688.
Bieging John H.
Glenn Jason
Jewell Phil R.
Walker Christopher K.
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