Interstellar NA I and CA II absorption in intercloud regions

Details Interstellar NA I and CA II absorption in intercloud regions Interstellar NA I and CA II absorption in intercloud regions

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..628h&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 1, p. 628-633.

Astronomy and Astrophysics

Astrophysics

26

Absorption Spectra, Interstellar Matter, Line Spectra, Abundance, Calcium, D Lines, Density Distribution, H I Regions, Interferometers, Sodium, Vertical Distribution

Scientific paper

The weak interstellar absorption lines of Na I, Ca II, and H I formed in the intercloud medium toward eight nearly unreddened stars are analyzed. Compared with the corresponding column densities within a standard cloud, the Na I/H column-density ratio is smaller by a factor probably in excess of 17, while the Ca II/H column-density ratio is about normal. These results imply that the local intercloud medium extensively contains low-density H I regions in which the temperature is at least about 2500 K and the depletion of calcium is less severe than in the clouds, by a factor of 20.

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