HST NICMOS 2 μ m Polarization Studies of Proto-Planetary Nebulae

Details HST NICMOS 2 μ m Polarization Studies of Proto-Planetary Nebulae HST NICMOS 2 μ m Polarization Studies of Proto-Planetary Nebulae

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713103s&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #131.03; Bulletin of the American Astronomical Society, Vol. 33, p.716

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We report the HST NICMOS 2 μ m polarization imaging of four bipolar proto-planetary nebulae (PPNs): IRAS 17150-3224, IRAS 17441-2411, IRAS 17245-3951 and IRAS 16594-4656. The reflection lobes of each are highly polarized (up to 50%-60%) and possess general centro-symmetric polarization patterns, indicating that the nebulosity is illuminated by the central source. The centroid of the centro-symmetric vectors is also coincided with the central star resolved in the H and K band images. Some departures from the centro-symmetric patterns are seen along the highly obscuring equatorial region and are presumably caused by multiple scattering. In addition to the centro-symmetric polarimetric patterns, point-symmetric patterns are also seen in these four PPNs. Such patterns in these PPNs provides strong, independent evidence for the presence of a circumstellar disk. Decreased polarization is found inside the bipolar reflection lobes of IRAS 17150-3224 and IRAS 17441-2411. With the help of the molecular hydrogen image of IRAS 17150-3224, we conclude that the cause of this decreased polarization is dilution due to a warm dust component within the lobes. Support to attend the AAS meeting was provided by the Izzak Walton Killam Memorial Scholarship, University of Calgary.

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