Other
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1822h&link_type=abstract
IUE Proposal ID #GHGLH
Other
Scientific paper
We propose continued high-dispersion IUE observations of interstellar absorption lines in the spectra of early-B stars at high galactic latitude. Our primary goal in to determine the column density Nalpha (H I) of neutral gas toward each of 8 faint, probably distant stars, from the Ly-alpha line. The measurements will be used to critically supplement similar Ly-alpha, data already obtained from both Copernicus and IUE toward about 45 other high-latitude OB stars, as well as new 21-cm emission-line profiles which we have observed toward the entire set of stars. These measurements will allow the first direct, accurate, comprehensive study of the density distribution of the cold, neutral interstellar gas with distance from the galactic plane, near the solar circle. Either the ratios [N 21 (H 1)/N-alpha(H I)) or the differences [N (H I)-N-alpha (H I)] give the amounts of neutral gas both in front of and beyond the accurately known position of each suitable star in the halo. This neutral gas is believed to constitute about go% of the total mass of the gaseous halo.
Hobbs Lewis M.
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