Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc..159k&link_type=abstract
The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El
Other
2
Scientific paper
Despite the fact that they mostly reveal the ISM in a negative sense, UV measurements can add to our knowledge of its structure in nearby galaxies. Dust is crucial in modulating everything we see, to such an extent that stars seen through a significant column density of absorbing material disappear from our samples rather than appearing as reddened, an effect which is particularly clear in the case of M33. Hot stars are easily selected and characterized in the ultraviolet, naturally, as long as they are relatively unreddened, and can also yield the shape of the reddening curve. OB associations, the stellar populations in HII regions, are much brighter here than any other wavelength regime. While some of the requisite data for a deep UV census of the massive-star population in both M31 and M33 already exist, the role of evolved stars is important enough to make this work slower and more involved than might have been hoped. In a more global sense, working from morphology and integrated spectra, comparison of these nearby, luminous galaxies to other systems at high redshift may shed light on the Lyman-escape problem and the star-formation history of genuinely young galaxies.
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