Abstract
The observed relation between the interstellar linear polarization curve parameters K and λ max characterizing the width and the wavelength of the polarization maximum, respectively, is interpreted quantitatively. We have considered 57 stars located in four dark clouds with evidence of star formation: in Taurus, Chamaeleon, around the stars ρ Oph and R CrA. In our modeling we have used the spheroidal dust grain model applied previously to simultaneously interpret the interstellar extinction and polarization curves in a wide wavelength range. The observed trend K ≈ 1.7λ max is shown to be most likely related to the growth of dust grains due to coagulation rather than accretion. The relationship of the interstellar polarization curve parameters K and λ max to the mean dust grain size is discussed.
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Original Russian Text © N.V. Voshchinnikov, H.K. Das, I.S. Yakovlev, V.B. Il’in, 2013, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2013, Vol. 39, No. 7, pp. 481–492.
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Voshchinnikov, N.V., Das, H.K., Yakovlev, I.S. et al. Systematic variations of interstellar linear polarization and growth of dust grains. Astron. Lett. 39, 421–431 (2013). https://doi.org/10.1134/S1063773713070086
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DOI: https://doi.org/10.1134/S1063773713070086