Abstract
In this paper we present further results of the calculation of anomalous extinction laws following Steenman and Thé (1989). The extinction laws in this article are calculated by enlarging the lower size cutoff of the particle size distribution, as opposed to the laws in the previous paper, which were obtained by making the upper size cutoff larger. The extinction laws we have 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 ofR becomes larger, (2) in the ultraviolet the 2200 Å bump disappears gradually as the lower size cutoff is made larger, (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.
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Steenman, H., Thé, P.S. The anomalous extinction law. Astrophys Space Sci 184, 9–30 (1991). https://doi.org/10.1007/BF00644862
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DOI: https://doi.org/10.1007/BF00644862