Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..172y&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 172-195.
Astronomy and Astrophysics
Astronomy
117
Abundance, Interstellar Gas, Interstellar Radiation, Line Of Sight, Spectral Line Width, Ultraviolet Astronomy, Argon, Carbon, Hydrogen Ions, Nitrogen, Oxygen, Sulfur, Sun
Scientific paper
Profile fitting of ultraviolet interstellar absorption lines is used to separate five different absorbing regions between Earth and the nearby star λ Sco. Two diffuse H II regions are found to be density bounded, with ne 0.1 and T ˜ l04 K, and to have depletions of the refractory species Fe and Si similar to those found for the H I regions in the same direction. The ionization of these components is consistent with a radiation field typical of a 24,000 K star pervading most of the space along this line of sight. A single (warm) H I region is found, with a size ≲ 5 pc. Two additional, possibly shock-heated components may be related to the H II regions or to the H I region. High-resolution observations are described that would allow a more definitive model to be constructed for this line of sight.
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