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  • 1975-1979  (2)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Considerations about the absorption efficiency of dust particles in the infrared (1975)
    Springer
    Astrophysics and space science 34 (1975), S. 191-197 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Analytical approximations used often in the literature for calculating energy rates emitted by dust grains in infrared are discussed. Comparisons with correct complete formulations are made for three grain models: (1) pure graphite, (2) ice mantle-graphite core, (3) silicates. λ-1 and λ-1 dependences for the average effective emissivity of such grains are used. We find that for silicate and graphite grains the simplified approximations are valid only when accuracies between 10% and 50% are required and only for grain temperatures higher than 80 K. At lower temperatures the validity of the approximations fails for the graphite particle while it is variable for the silicate dust grain. The ice core mantle particles can instead be treated with approximated formulae without introducing appreciable errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646759
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Planck mean efficiency factors for six material candidates as interstellar grains (1976)
    Springer
    Astrophysics and space science 41 (1976), S. 447-474 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Planck mean absorption cross-sections have been computed for spherical grains composed of graphite, iron, ice, olivine, amorphous quartz and a lunar silicate. Experimentally determined infrared optical constants have been used for all these materials. Ice mantle particles and planetesimal particles (iron core and olivine mantle) have also been considered with values of outer and inner radii covering a wide range of astrophysical conditions. The results given both graphically and in a tabular form are discussed and compared with those of other authors. The relationships of mantle and core properties are also critically discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646193
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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