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Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8198g&link_type=abstract
HST Proposal ID #8198
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Hst Proposal Id #8198 Interstellar And Intergalactic Matter
Scientific paper
The similarities between the ultraviolet extinction found in the star forming bar of the Small Magellanic Cloud {SMC} and starburst galaxies has highlighted the importance of understanding the dust extinction in the SMC. The behavior of the UV extinction in the SMC is unlike that seen in any other Local Group galaxy. In a recent study, it was shown that the traditional {no 2175 Angstrom bump, high far-UV rise} SMC extinction curve is seen in the SMC's star forming bar, while outside of this bar a much more Galactic {2175 Angstrom bump, weaker far-UV rise} extinction curve is seen. These results are tentative due to the fact that only four extinction curves are known with certainty in the entire SMC. We propose to determine the ultraviolet extinction curves toward three additional stars stars in the SMC. These sightlines were chosen to be located near differing levels of star formation activity. In addition to helping understand the origin of the UV dust extinction in st arburst galaxies, study of the spatial variation of UV extinction in the SMC also holds the promise of helping to understand the origin of the 2175 Angstrom bump. Understanding the behavior of dust in starburst regions is important as the differences between the extinction corrections for the Milky Way and the SMC is a factor of 10 at 1500 Angstrom.
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