High resolution H band imaging polarimetry of IRC +10216. The obscured location of the central star

Details High resolution H band imaging polarimetry of IRC +10216. The obscured location of the central star High resolution H band imaging polarimetry of IRC +10216. The obscured location of the central star

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...436..601m&link_type=abstract

Astronomy and Astrophysics, Volume 436, Issue 2, June III 2005, pp.601-606

Astronomy and Astrophysics

Astrophysics

15

Infrared: Stars, Stars: Individual: Irc +10216, Techniques: Polarimetric, Circumstellar Matter

Scientific paper

We have carried out an H band imaging polarimetry of an evolved AGB star IRC +10216 using CIAO and AO on the Subaru telescope. Our polarimetric images show NE-S bipolar lobes, a NW lobe, a discrete NW arc with ~4.2 arcsec radius and two new features of a fan-like shape at the SE and of an elliptic shape at the NW with small polarizations (P<4%) near the intensity peak. The polarization vectors in the NE-S lobes and the NW lobe have a centrosymmetric pattern centered at the position of the illumination source (the central star). The illumination source is located at (+0.25 arcsec, -0.065 arcsec) from the intensity peak between the SE fan and the NW ellipse. The polarization vectors between these two features are aligned along a line across them. We interpret that the appearance of the SE fan and the NW ellipse reflects a sudden increase of the mass loss rate that likely initiated the formation of an edge-on dust torus. This sudden mass loss increase probably began about a half century ago.

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