Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104...57l&link_type=abstract
Astronomy and Astrophysics, vol. 104, no. 1, Dec. 1981, p. 57-64. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
19
Astronomical Models, Hydrogen Clouds, Linear Polarization, Near Infrared Radiation, Nebulae, Polarimetry, Bipolarity, Hydrogen Ions, Molecular Clouds, Radial Distribution, Radiant Flux Density, Stellar Luminosity
Scientific paper
Optical and near-infrared polarimetric observations of the bipolar nebula S106 have revealed the presence of significant reflection nebulosity associated with this source at wavelengths of 0.4, 0.8, and 2.2 microns. The radial pattern of polarization is consistent with the hypothesis that S106 3 is the source of illumination for the nebula. The large degree of polarization at 2.2 microns implies that the albedo of the grains must be relatively high at these wavelengths, and that the average radius of the grains is probably greater than 0.08, the mean value assumed for interstellar grains. Analysis of infrared data and data from Herter et al. (1981) on S106 shows that the optical depth to S106 3 is probably near 2.5, implying that the distance to the star is between 200 and 750 pc. The morphology of S106 suggests the blister model of Israel (1978), in which the exciting star is imbedded in a torus or shell of dust and gas.
Boyle D.
Lacasse Marc G.
Levreault R.
Pipher Judith L.
Sharpless Stewart
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