Interstellar absorption in intercloud regions. II - Detection of the NA I lines

Details Interstellar absorption in intercloud regions. II - Detection of the NA I lines Interstellar absorption in intercloud regions. II - Detection of the NA I lines

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l.117h&link_type=abstract

Astrophysical Journal, vol. 206, June 1, 1976, pt. 2, p. L117-L120.

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24

Absorption Spectra, Abundance, D Lines, Interstellar Extinction, Sodium, Calcium, H Lines, Spectral Line Width

Scientific paper

The weak interstellar absorption lines of Na I, Ca II, and H I formed in the intercloud medium toward seven nearly unreddened stars are analyzed. Together with the widths of the Na I and Ca II lines, the Na I/H column-density ratios determine limits on the temperature of the absorbing gas, while the Ca II/H ratios establish limits on its calcium depletion. If the electron density is about 0.02 per cu cm in the absorbing regions, two of the seven temperatures are between 3200 K and 6000 K, while three others exceed lower limits ranging from 1400 K to 6500 A. The calcium depletions generally are less severe than in a typical cloud by at least an order of magnitude.

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