Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..703m&link_type=abstract
Nature, vol. 287, Oct. 23, 1980, p. 703-705.
Astronomy and Astrophysics
Astronomy
15
Emission Spectra, Linear Polarization, Optical Polarization, Stellar Radiation, Supernova Remnants, Astronomical Models, Doppler Effect, Electron Scattering, Gallium Arsenides, H Alpha Line, Interstellar Extinction, Wavelengths, X Ray Sources
Scientific paper
Observations of variable linear polarization in the optical range in the unique radio and X-ray source SS 433, which is characterized by moving emission lines in its visible and near-IR spectra, are reported. The observations were made with an unfiltered GaAs photocathode covering the spectral region 3000-9000 A, with a passband characteristic wavelength near 7000 A. Measurements reveal the presence of both a long-term and a very short time-scale variation in linear polarization in the continuum and in H-alpha, which indicate that a substantial fraction of the polarization is intrinsic to SS 433 and not produced in the interstellar medium. It is suggested that the most likely source of polarization in the optical continuum is electron scattering, and constraints on models of SS 433 implied by the discovery of intrinsic polarization are considered.
McLean Ian S.
Tapia Saul
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