Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..94..333h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 94, no. 2, Aug. 1983, p. 333-349.
Astronomy and Astrophysics
Astrophysics
19
Cosmic Dust, Infrared Absorption, Stellar Envelopes, Supergiant Stars, Infrared Spectra, Late Stars, Optical Thickness, Oxygen, Stellar Temperature
Scientific paper
In this paper, the mean relative efficiency factors for absorption of dust grains in the wavelength range from 8 to 22 microns have been derived from IR spectra of the optically thin dust shells surrounding the O-rich supergiants Mu Cep, Alpha Ori, X Her, and R Cas. The resulting absorption efficiency curve has been extrapolated into the near as well as the far infrared regions, with an allowance made for restrictions set by experience. Planck mean efficiency factors have been calculated for the temperature range from 30 to 1500 K. The curve Qp(T), which shows a maximum at T = 300 K, has been approximated conveniently by a power law on either side of this maximum.
Dorschner Johann
Guertler J.
Henning Th
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