Optical polarization and near IR photometry of the proto-planetary nebula Hen 3-1475

Details Optical polarization and near IR photometry of the proto-planetary nebula Hen 3-1475 Optical polarization and near IR photometry of the proto-planetary nebula Hen 3-1475

2002-12-19

arxiv.org/abs/astro-ph/0212435v1

Astrophys.J. 587 (2003) 312-319

Astronomy and Astrophysics

Astrophysics

ApJ accepted, 16 pages, 6 figures

Scientific paper

10.1086/368073

We present BVRI CCD aperture polarization and near-infrared photometry of the proto-planetary nebula Hen 3-1475. Its intrinsic polarization is high and shows a strong spectral dependence. The position angles in all bands are perpendicular to the axis of the observed bipolar structure. A Monte Carlo code is used to model the intrinsic polarization of \hhe. Using disk dimensions and other constraints suggested by previous works, we are able to reproduce the observations with an optically thick disk composed by grains with a power-law size distribution ranging from 0.06 to 0.22 um. We also reliably estimate the foreground polarization from hundreds of stars contained in the CCD images. It is parallel to the intrinsic polarization of Hen 3-1475. Possible implications of this result are discussed. From IR observations, we estimate a interstellar reddening, A(V), of about 3.2.

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