Other
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lastr..99..219a&link_type=abstract
L'Astronomie (ISSN 0004-6302), vol. 99, May 1985, p. 219-230. In French.
Other
Interstellar Matter, Iue, Milky Way Galaxy, Cosmic Dust, Hydrogen Clouds, Interstellar Extinction, Molecular Clouds, Stellar Evolution, Supernovae
Scientific paper
Data from the Copernicus and IUE satellites, among others, have expanded the understanding of processes underway in the interstellar medium in the Milky Way. The medium is a mixture of bright nebulosities and dark clouds. Distributions have been estimated for dust clouds which absorb light from stars that could otherwise be viewed. The absorption spectra are accompanied by reddening because long wavelength light is absorbed, causing color excesses in clouds viewed. The dust grains have a projected average diameter of 0.5 micron and consist of metal, ice, carbon and NH3. The most concentrated clouds surround stars. Light passing through the clouds is polarized along the galactic plane by the 6-millionths gauss interstellar magnetic field. Nebulosity gases are heated by nearby hot stars and emit UV radiation from excited atoms, H in particular, and also O III. Radio data have revealed molecular clouds of unstable organic matter, which sometimes feature masers. Coronal gases surpassing 1 million K in temperature have been detected by the UHURU and SAS 2 spacecraft. Finally, calculations are presented to indicate the pathways taken in the evolution of stars from the interstellar clouds.
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