Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.329..419j&link_type=abstract
Nature (ISSN 0028-0836), vol. 329, Oct. 1, 1987, p. 419-421.
Physics
32
Asymmetry, Polarized Electromagnetic Radiation, Stellar Spectra, Supernova 1987A, Continuous Spectra, Radiative Transfer, Stellar Atmospheres, Stellar Models, Stellar Radiation, Stellar Structure
Scientific paper
Polarimetry done by Schwarz and Mundt (1987) on the type II supernova 1987A showed variation in polarization across line profiles. The polarization structure is interpreted as arising from an asymmetric, homologously expanding, scattering atmosphere surrounding an asymmetric continuum-producing photosphere. Resonant scattering of radiation by ions in the atmosphere produces the line structure in the flux spectrum and polarizes the emergent radiation. The asymmetric shape of the atmosphere causes a nonzero net polarization. Sobolev-method radiative transfer calculations with axisymmetric oblate ellipsoidal models have been carried out to fit the observed data. The models are parameterized by the ratio of the symmetry axis to the perpendicular axis. The fits to the 1987A data indicate that this ratio is about 0.6-0.8.
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