Computer Science
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........8s&link_type=abstract
Ph.D. Thesis Colorado Univ., Boulder.
Computer Science
12
Grains, Interstellar Extinction, Interstellar Matter, Ultraviolet Radiation, Anomalies, Iue, Stars, Supernova Remnants
Scientific paper
The IUE satellite was used to derive UV extinction curves for 58 stars, ranging in spectral type from 06 to A5, and with E(B-V) reddenings from 0.09 to 1.59 mag. Anomalous extinction curves were particularly sought in the project. The most striking discovery was the near absence of the 2175 A extinction feature from the line of sight towards HD 29647 in the Taurus dark cloud. The collection of data was analyzed in several ways. Patterns are sought in the collection as a whole, in homogeneous subsets of the data, and in relation to diffuse band strengths. A search for diffuse bands in the UV was done by stacking 48 of the extinction curves to reduce the noise. The stacked curve showed no evidence of new diffuse bands. To help interpret the anomalous extinction curves, a theoretical simulation of grain processing in interstellar shocks was undertaken. Shock processing was found to cause strong 2175 A bumps and high far UV extinction. Comparison to extinction curves associated with supernova remnants confirms the predictions of strong 2175 A bumps, and partially confirms the prediction of high far UV extinction.
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