Titlebook: Solid State Astrophysics; Proceedings of a Sym N. C. Wickramasinghe,D. J. Morgan Conference proceedings 1976 D. Reidel Publishing Company,

inquisitive

ARY

Diffuse Band Extinction and Polarization in Core-Mantle Grainsthickness. 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. Th

Cardiac

maculated

Nucleation and Growth of Dust Grainsth gas molecules are required. For carbon-rich stellar atmospheres, hydrocarbons act as intermediaries for converting acetylene gas into carbon particles. For oxygen-rich atmospheres, magnesium silicate grains form by surface nucleation. Sputtering and coalescence of grains is discussed.

遗弃

NAV

arbiter

Effects of Charged Dust Grainsthe following phenomena which are otherwise hardly explicable. (1) A considerable fraction of electrons knocked-out by charged grains of high speeds have energies around 15 eV and produce singly ionized ions but not doubly ionized ones in accord with an ultraviolet observation of interstellar atoms

Flavouring

Large-Scale Ionization Fronts and the Nature and Distribution of Light Scattering Particles in the Ontral 15 arc min of the nebula in Hα, [N .] (λ 6584 Å), Hβ and continuum at λ 4700 Å. Maps of the ratios Hα/[N .] and (for the first time) of continuum/Hβ have been produced with unprecedented spatial resolution. These show that the gas to dust ratio is high near the exciting stars and falls strongl

纬线

Thermal Emission Spectra of Silicates from Planetary Nebulaemed using dielectric constants of lunar silicates. The results have been compared with previous work on pure graphite and ice-mantle grains. Lα heating of dust followed by thermal re-emission is consistent with the large infrared excesses detected in planetary nebulae. An extra source of heating is,

novelty