Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..514f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 514-523.
Other
36
Interstellar Gas, Interstellar Matter, Ionized Gases, Molecular Clouds, Ultraviolet Spectra, Absorption Spectra, Iue, Line Spectra, Solar System
Scientific paper
Due to dielectric recombination, neutral magnesium represents an important tracer for the warm low-density gas around the solar system. New Mg I 2852 absorption-line data from IUE are presented, including detections in a few stars within 40 pc of the sun. The absence of detectable Mg I in Alpha CMa and other stars sets limits on the combined size and electron density of the interstellar cloud which gives rise to the local interstellar wind. For a cloud radius greater than 1 pc and density of 0.1/cu cm, the local cloud has a low fractional ionization, n(e)/n(tot) less than 0.05, if magnesium is undepleted, equilibrium conditions prevail, the cloud temperature is 11,750 K, and 80 percent of the magnesium in the sightline is Mg II.
Fowler James R.
Frisch Priscilla C.
Welty Daniel E.
York Don G.
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