Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.184....9s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 184, no. 1, Oct. 1991, p. 9-30.
Astronomy and Astrophysics
Astronomy
50
Infrared Absorption, Interstellar Extinction, Mie Scattering, Particle Size Distribution, Spectral Energy Distribution, Ultraviolet Radiation, A Stars, B Stars, Infrared Astronomy Satellite, Iue
Scientific paper
Further results of the calculation of anomalous extinction laws following Steenman and The (1989) are presented. The extinction laws are calculated by enlarging the lower size cutoff of the particle size distribution. The extinction laws derived have three important properties: (1) the change in the infrared is similar as in the case of changing the upper size cutoff; the difference increases as the value of R becomes larger; (2) in the ultraviolet the 2200-A bump disappears gradually as the lower size cutoff is made larger; and (3) in the far-UV the extinction curves become more and more flat. The ultraviolet extinction laws in the direction of the stars HD 200775 and HD 259431 are lower than the Savage and Mathis (1979) galactic interstellar extinction law.
Steenman H.
Thé Pik-Sin
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