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Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5349b&link_type=abstract
HST Proposal ID #5349
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Hst Proposal Id #5349 Interstellar Medium Dust
Scientific paper
The interstellar dust in galaxies is an important tracer of the global abundance of C and heavy elements. The outstanding signature of dust presence and its properties is the strong extinction of stellar emission in the UV, with a broad 2200A bump and increase at shorter wavelengths. The steepness of the FUV extinction has large effects on the ionisation and molecular chemistry of a Galaxy. As well as being an important clue to a galaxy's global evolution, observations of nearly every astrophysically interesting object must be corrected for extinction to study its intrinsic properties. The UV extinction curve is different in the Magellanic Clouds, which have different metallicity from our Galaxy. Our study of UV spectra of hot stars in M31 and M33 with IUE and HST-FOS indicated a UV extinction curve different from the average galactic in both M31 and M33. The foreground galactic halo extinction towards M31 and M33 also differs from the standard Galactic, so that this needs to be established as well as the halo and disk extinction of M31 and M33. This proposal addresses the problem, by obtaining FOS spectra of reddened and unreddened stars in M31 and M33. For these we have accurate spectral types from good quality ground-based spectra, and UV flux measurements from UIT. We also request WFPC2 parallel imaging to reveal other reddened stars.
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