Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1814g&link_type=abstract
IUE Proposal ID #IEGCG
Computer Science
Scientific paper
It has become increasingly evident since the launch of IUE that there is no such thing as a mean galactic extinction low in the ultraviolet. This has important implications, both for attempts to derive unreddened stellar continua by an application of an average extinction low, and for models of the dust composition, size, and dynamical history of the interstellar medium. It is also possible to study the UV extinction in nearby galaxies and contrast it with our own. In the Large Magellanic Cloud (LMC), the "average" curve in the UV is higher, and in the SMC it is still higher. In addition, the curves derived in different studies show an enormous range in strengths. We propose to study the extinction in the SMC by pairing reddened and unreddened stars of similar spectral type. These stars have been identified from classification slit spectra we are taking as part of a separate observing program. We plan to combine IUE data with visual scanner data to derive an extinction curve over a long baseline. This will enable us to determine if a mean extinction low exists in the SMC and if some of the variation in derived laws is due to spectral mismatch. If a variety of UV extinction properties are found, then we will examine regional effects. The SMC is a key galaxy because of its low chemical abundance, and it is important to explore the extinction from a study of normal early-type stars which are unlikely to suffer abnormal circumstellar absorption. It is this group of stars, not previously identified in the SMC, that we propose to observe.
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