Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345...80g&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 80-83 (SEE N85-15539 06-90)
Astronomy and Astrophysics
Astrophysics
3
Interstellar Gas, Line Of Sight, Line Spectra, Space Density, Astrophysics, H I Regions, H Ii Regions, Hydrogen, Ionization, Oao 3, Spectrographs, Sun, Temperature, Ultraviolet Spectra
Scientific paper
The line of sight to Beta CM a was probed by Copernicus observations. This particular line of sight is remarkable for the low mean densities. The density was found to be bar NH approximately .002/cu cm. Two separate regions were distinguished: (1) A local nearby HI region extends over a few parsecs from the Sun with a density of the order of 0.1/cu cm and a temperature of 11000 to 12500 K; (2) An HII region lies somewhere beyond the HI region and is spread over about 60pc. Its total hydrogen mean density is of the same order as the HI region, i.e., of approximately 0.1 cu cm and it contains only elements in low ionization state. All the ata are coherent with the picture of a cloud in ionization equilibrium at T approximately 23000 deg K.
Gry Cecile
Vidal-Madjar Alfred
York Don G.
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