Abstract
view Abstract Citations (16) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical interstellar lines in dark clouds. II K I and ultraviolet sodium lines. Cohen, J. G. Abstract New observations of the K 1 and ultraviolet Na I interstellar lines are presented for some stars embedded in dense clouds and for a few supergiants. The new observations of weak lines, which are essentially unaffected by the adopted velocity distribution for the interstellar material, support the conclusions previously obtained from the interstellar D-lines of Nai and H- and K-lines of Ca ii. The new data, when combined with a discussion of the ionization equilibrium, indicate no or moderate depletions at the edges of clouds, but some depletions in the central regions. Subject headings: abundances, nebular - interstellar matter - nebulae Publication: The Astrophysical Journal Pub Date: September 1974 DOI: 10.1086/153068 Bibcode: 1974ApJ...192..379C full text sources ADS | data products SIMBAD (18) Related Materials (1) Part 1: 1973ApJ...186..149C
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