Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..345b&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
4
Cosmic Plasma, Galactic Structure, Iue, Milky Way Galaxy, Ultraviolet Astronomy, Absorption Spectra, B Stars, Carbon, Disks (Shapes), Ion Density (Concentration), Nitrogen, Oao 3, Oxygen, Silicon, Stellar Spectra
Scientific paper
Some high dispersion spectra of 13 halo and disc stars were reduced and column densities of C IV presented. The galactic distribution of C IV is discussed and, combining the data with other published measurements, a mean exponential scale height of 3 + 2 -1 kpc and disk space density no = 8.5 x 10 to the minus 9th power cu cm are derived. The results were compared with Copernicus O VI data. Strengths and profiles of Si IV, C IV and N V from International Ultraviolet Explorer data were also compared for a few representative lines of sight. N V/O VI ratios imply log T 5.5, while SI IV/C IV (including the value for the whole halo towards 3C 273) require 4.80 less than Log T less than 4.95.
Bromage Gordon E.
Gabriel Alan H.
Sciama Dennis W.
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