Other
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..593g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. 593-599.
Other
86
B Stars, Interstellar Gas, Interstellar Matter, Line Of Sight, Abundance, Least Squares Method, Oao 3, Oscillator Strengths, Ultraviolet Spectra
Scientific paper
Copernicus UV data on interstellar lines in the spectrum of Beta CMa are analyzed to study the physical conditions in the (nearby) interstellar medium in this direction. The derived abundances indicate a very weak neutral component which, from comparison with other results concerning the nearby ISM, appears to be confined to the first few parsecs, with a density of 0.1 per cu cm. Furthermore, the ionized gas appears to be more abundant than the neutral gas. It has a density also around 0.1 per cu cm (derived from the excited level of C II) and ionization ratios consistent with a collisional equilibrium temperature of 25,000 K, filling 20-45 percent of the line of sight. A marginal detection of O VI indicates the presence of very diffuse coronal gas. The location of the ionized phases as well as the ionizing mechanisms are not yet clear and need to be further discussed through model comparisons.
Gry Cecile
Vidal-Madjar Alfred
York Don G.
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