Abstract
Diffuse band shapes in both extinction and polarization are calculated for interstellar coremantle particles for varying size distributions of mantle thickness. It is shown that no matter whether the source of the bands is in the silicate cores or the accreted icy mantles the polarization shapes are highly asymmetric for all mantle thicknesses. The extinction band shapes are significantly less asymmetric although the effect is clearly present. The only apparent possibility for producing symmetric band shapes in the dust grains is in the very small bare particles in interstellar space which, if they are aligned and produce the λ 2200 band, must exhibit a strong polarization effect in this region.
Work supported in part by NASA Grant NGR-33-011-043.
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Greenberg, J.M., Hong, SS. (1976). Diffuse Band Extinction and Polarization in Core-Mantle Grains. In: Wickramasinghe, N.C., Morgan, D.J. (eds) Solid State Astrophysics. Astrophysics and Space Science Library, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1884-5_7
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