Spectropolarimetry and Radiative Transfer Modeling of Three Proto-Planetary Nebulae

Details Spectropolarimetry and Radiative Transfer Modeling of Three Proto-Planetary Nebulae Spectropolarimetry and Radiative Transfer Modeling of Three Proto-Planetary Nebulae

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...624..957o&link_type=abstract

The Astrophysical Journal, Volume 624, Issue 2, pp. 957-972.

Astronomy and Astrophysics

Astronomy

9

Ism: Dust, Extinction, Stars: Agb And Post-Agb, Stars: Individual: Alphanumeric: Iras 04296+3429, Stars: Individual: Alphanumeric: Iras 08005-2356, Stars: Individual: Alphanumeric: Iras 17441-2411, Techniques: Polarimetric

Scientific paper

We measured the spectrum of polarization for three proto-planetary nebulae (PPNs), IRAS 17411-2411, IRAS 08005-2356, and IRAS 04296+3429, and made model calculations with the dust-scattering Monte Carlo code DIRTY and the dust emission code 2Dust. We show that high levels of polarization in these PPNs correlate with extreme asymptotic giant branch (AGB) superwind mass-loss rates in excess of 10-4 Msolar yr-1. All three objects show evidence for evacuated lobes cleared by collimated fast winds, and two indicate a significant equatorial mass enhancement. Our best-fit models require sharply peaked grain size distributions, suggesting that most of the light is being scattered by grains of a characteristic size in IRAS 17441-2411 and IRAS 08005-2356. IRAS 17441-2411 and IRAS 08005-2356 have lobes with wide opening angles, perhaps produced by deflection of a polar jet from an accreting companion by the AGB superwind. Modeling the spectropolarimetry of IRAS 04296+3429 indicates a point-symmetric, multipolar morphology in the PPN phase. The modeling of spectropolarimetry and other observations of PPNs provides a powerful way to constrain circumstellar morphology and dust parameters.

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