Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-02
Mon.Not.Roy.Astron.Soc.374:176-186,2007
Astronomy and Astrophysics
Astrophysics
6 figures (linked to autours website) and 6 tables. MNRAS accepted
Scientific paper
10.1111/j.1365-2966.2006.11135.x
We present near-infrared polarimetric images of the dusty circumstellar envelope (CSE) of IRAS 19306+1407, acquired at the United Kingdom Infrared Telescope (UKIRT) using the UKIRT 1-5 um Imager Spectrometer (UIST) in conjunction with the half-waveplate module IRPOL2. We present additional 450 and 850 um photometry obtained with the Sub-mm Common User Bolometer Array (SCUBA) at the James Clerk Maxwell Telescope (JCMT), as well as archived Hubble Space Telescope (HST) F606W- and F814W-filter images. The CSE structure in polarized flux at J- and K-bands shows an elongation NNE-SSW with two bright scattering shoulders NW-SE. These features are not perpendicular to each other and could signify a recent `twist' in the outflow axis. We model the CSE using an axisymmetric light scattering (ALS) code to investigate the polarization produced by the CSE, and an axisymmetric radiation transport (DART) code to fit the SED. A good fit was achieved with the ALS and DART models using silicate grains, 0.1-0.4 um with a power-law size distribution of a^-3.5, and an axisymmetric shell geometry with an equator-to-pole contrast of 7:1. The spectral type of the central star is determined to be B1I supporting previous suggestions that the object is an early PN. We have constrained the CSE and interstellar extinction as 2.0 and 4.2 mag respectively, and have estimated a distance of 2.7 kpc. At this distance the stellar luminosity is ~4500 L_sun and the ~5300 yrs with a mass-loss rate of ~3.4x10^-5 M_sun yr^-1.
Gledhill Tim M.
Lowe K. T. E.
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