منابع مشابه
Interstellar extinction by porous grains
Interstellar extinction curve E(λ-V)/E(B-V) vs 1/λ is evaluated in the spectral range 3.4 μm and 0.1 μm using the extinction efficiencies of the porous silicate and graphite grains. The extinction efficiencies of the porous silicate and graphite grains are computed using the discrete dipole approximation (DDA). The model curves are compared with the average observed interstellar extinction curv...
متن کاملInterstellar Extinction by Spheroidal Dust Grains
Observations of interstellar extinction and polarization indicate that the interstellar medium consists of aligned non-spherical dust grains which show variation in the interstellar extinction curve for wavelengths ranging from NIR to UV. To model the extinction and polarization, one cannot use the conventional Mie theory which assumes the grains as solid spheres. We have used a T-matrix based ...
متن کاملInterstellar extinction by fractal polycrystalline graphite clusters ?
Interstellar extinction by fractal polycrystalline graphite clusters?, Andersen et al. Abstract Certain dust particles in space are expected to appear as clusters of individual grains. The morphology of these clusters could be fractal or compact. To determine how these structural features would affect the interpretation of the observed interstellar extinction peak at ∼ 4.6 µm, we have calculate...
متن کاملOn correlations between diffuse interstellar bands
One way to better apprehend the problem of diffuse interstellar bands (DIBs) is to search for correlations between the bands in a large sample of spectra towards various lines of sight: a strict correlation may imply that a common carrier is at the origin of the bands, whereas a non-correlation means that different species are involved. We propose this observational test for 10 DIBs collected i...
متن کاملTwo Lines of Sight with Exceedingly Anomalous Uv Interstellar Extinction
Low resolution IUE data obtained towards HD 62542, a B5 V star in a line of sight associated with a dark cloud in the Gum Nebula region near & Pup (OS Iaf) and y Vel (WC8 + 09 I), yields an extinction curve with an extremely broad and weak W extinction bump and the highest far-UV extinction yet obseaved in the Milky Way, reaching a value of E(1200-V)/E(B-v)p115. The weak bump is very similar to...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1987
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/229.2.213