Polarization Measurements of Post-Asymptotic Giant Branch Candidates and Related Stars

Details Polarization Measurements of Post-Asymptotic Giant Branch Candidates and Related Stars Polarization Measurements of Post-Asymptotic Giant Branch Candidates and Related Stars

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....129.2451p&link_type=abstract

The Astronomical Journal, Volume 129, Issue 5, pp. 2451-2460.

Astronomy and Astrophysics

Astronomy

5

Stars: Circumstellar Matter, Infrared: Stars, Polarization, Stars: Agb And Post-Agb, Stars: Evolution

Scientific paper

We have obtained UBVRI polarization measurements of 26 post-asymptotic giant branch (post-AGB) candidates and related stars. The extremely metal-poor post-AGB star HR 4049 has been observed several times. In most cases we find the objects to be intrinsically polarized. The polarization measurements presented in this paper indicate asymmetric circumstellar dust shells and disks around these stars. For some objects the steep percent polarization λ-dependence and large degree of polarization suggest that scattering by circumstellar dust grains may be responsible for the observed polarizations in the blue.

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