Titlebook: Interstellar Dust; Proceedings of the 1 L. J. Allamandola,A. G. G. M. Tielens Conference proceedings 1989 International Astronomical Union

CRANK

胆小懦夫

Interstellar Extinction in External GalaxiesWay galaxy. This paper emphasizes studies of extinction in the Large and Small Magellanic Clouds. I discuss the UV extinction properties, as well as the optical and near-IR properties as determined from ground-based photometry.

Crumple

Dust Towards the Galactic Centredium. Further constraints on the nature of the dust grains are provided by Polarimetrie observations, which also lead to information on the stratification of the material along the line of sight. Finally some implications of the large polarized emission seen from the central regions are discussed.

Hemoptysis

Linear and Circular Polarization in the Diffuse Interstellar Mediumved linear and circular continuum polarization are described, with an emphasis on various constraints that might be placed on the nature of the polarizing grains and what additional observations would be of value. Complementary information can be obtained from polarization structure at spectral feat

使成波状

Diffuse Interstellar Bands — The Unidentified Part of the Interstellar Absorption Spectrum continuous extinction, polarization and atomic or molecular absorption lines. It is shown that DIBs do not form the absorption spectrum of one agent, but probably of several (3 or more). DIBs as well as other interstellar absorptions are usually formed in several clouds along a line-of-sight. Thus,

出血

Observations of HII Regions and Planetary Nebulae: The Infrared Emission Bands recent years. High quality data have shown many weak emission bands which are diagnostic of the material producing the bands. While correlations of the strengths of the narrow bands indicate that a single material can account for all of the narrow bands, independent spatial behavior of the narrow a

V切开

Aromatic Infrared Emission in Cirrus Clouds ., 1988., 1988.) axe presented which confirm that aromatic infrared bands account for at least a fraction of their near and mid-infrared cirrus emission as was suspected from indirect arguments. Large variations of the energy distribution among the IRAS bands are shown to be present in molecular cl

危险

The Infrared Emission Features and Polycyclic Aromatic Hydrocarbonspaper focuses on the spectroscopic issues raised by recent observational and experimental developments. These issues include: the position and profile of the “1310” cm. (“7.7” .m) feature, the position and intensities of the bands in the 910–710 cm. (11–14 .m) region, the newly detected 1900 cm. (5.

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Neonatal

Optical Properties of Carbonaceous Materialsxtures are analysed and compared with relevant literature. We find that the 2175 Å hump can be due to very small (< . > ≤ 10 Å) HAC grains. The UIR bands seem better explained by mixtures of HAC particles and collections of PAHs.