ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract In this paper the mean relative efficiency factors for absorption of dust grains in the wavelength range from 8 to 22 μm have been derived from IR spectra of the optically thin dust shells surrounding the O-rich supergiants μ Cep, αOri, X Her, and R Cas. The resulting absorption efficiency curve has been extrapolated into the near as well as the far infrared regions, having regard to restrictions set by experience. Planck mean efficiency factors have been calculated for the temperature range from 30 to 1500 K. The curveQ P(T), which shows a maximum atT=300 K, has been approximated conveniently by a power law on either side of this maximum.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00653723
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