Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..113b&link_type=abstract
Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 113-120.
Astronomy and Astrophysics
Astronomy
16
Cosmic Dust, Infrared Astronomy, Infrared Radiation, Novae, Seyfert Galaxies, Interstellar Matter, Light Curve, Radiant Flux Density, Space Temperature, Temperature Distribution, Variable Stars
Scientific paper
This paper considers the infrared emission by an assembly of identical static dust grains distributed with spherical symmetry about a centrally located variable source of short-wavelength radiation. The distribution of grain temperatures as seen by a distant observer is described for several simple light curves, and it is concluded that the angular diameter derived on the assumption that the source radiates as a blackbody is not a reliable measure of the actual angular diameter of an optically thin dust source. General expressions are given for the flux density at infrared frequencies; explicit expressions are given for the case in which the central source has a step-function light curve and the dust distribution is optically thin with a density that has a power-law dependence on distance from the central source. The possibility that superluminal effects might be observed at infrared wavelengths shortly after the outburst of a nova is briefly discussed.
Bode Michael F.
Evans Aaron
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