The wavelength dependence of interstellar circular polarization - an exception

Details The wavelength dependence of interstellar circular polarization - an exception The wavelength dependence of interstellar circular polarization - an exception

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231...73m&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 73-76. Research supported by the Battelle Memorial Institute.

Astronomy and Astrophysics

Astrophysics

3

Circular Polarization, Interstellar Matter, Polarized Radiation, Wavelengths, Grains, Linear Polarization

Scientific paper

Certain features have characterized the wavelength dependence of linear and circular polarization due to interstellar material. At visible wavelengths, a two-parameter empirical relation fits the wavelength dependence of the linear polarization. This polarization exhibits a maximum in the visible. The circular polarization changes handedness at or near the maximum in linear polarization. The circular polarization of HD 183143 does not follow this pattern. There is no evidence for intrinsic circular polarization in this star. Existing calculations do not fit the observed wavelength dependence. Ad hoc models invoking a peculiar index of refraction may provide an explanation of the observations, but detailed scattering calculations are needed.

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