Optical interstellar lines toward 18 stars of low reddening. III

Details Optical interstellar lines toward 18 stars of low reddening. III Optical interstellar lines toward 18 stars of low reddening. III

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..491h&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 491-507.

Astronomy and Astrophysics

Astrophysics

87

Abundance, Astronomical Spectroscopy, D Lines, Electrophotometry, Interstellar Matter, K Lines, Absorption Spectra, Calcium, Graphs (Charts), H Lines, Sodium, Stellar Spectra, Telluric Lines

Scientific paper

Photoelectric scans of the interstellar D-line of Na I and the K-line of Ca II are compared with those of H I and H2. Three general conclusions are drawn from the observations: (1) normal Na I/H ratios are found in 14 of the 18 cases studied, most likely due to absorption in cool, dense clouds; (2) low Na I/H ratios are observed in the direction of Gamma-Pegasus and Mu-Scorpio, implying that absorption occurs in clouds of warm (over 100 K) gas, or through extended paths of cool gas with low ionization; and (3) the absence of Na I, H I, and H2 lines toward Nu-Scorpio and Sigma-Sagittarius indicates that little neutral gas is present along these light paths.

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