Relationships between dust grain components responsible for observed interstellar extinction and polarization

Astronomy and Astrophysics – Astronomy

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Cosmic Dust, Grain Size, Interstellar Extinction, Polarization (Waves), Size Distribution, Astronomical Netherlands Satellite, Far Ultraviolet Radiation, Magnetic Fields, Visible Spectrum

Scientific paper

Ultraviolet extinction properties of interstellar dust are well observed. The amount of extinction measured in the visible (E(B-V)), at the 2200 A feature (E(BUMP)), and in the far ultraviolet (E(1550-V)) are only vaguely correlated indicating that at least 3 fairly independent populations of grains contribute to the overall extinction curve. A search of literature was made for polarimetric observations of the 1415 stars included in the extinction catalog derived from the Astronomical Netherlands Satellite (ANS) data. It was found that about 900 of the stars had at least one unfiltered polarimetric observation, p (%). In addition, 150 stars had calculated values of lambdamax (wavelength at which maximum polarization occurs). The lambdamax and p/E(B-V) parameters are discussed.

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