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Optical interstellar lines in dark clouds. II. K i and ultraviolet sodium lines

Cohen, Judith G. (1974) Optical interstellar lines in dark clouds. II. K i and ultraviolet sodium lines. Astrophysical Journal, 192 . pp. 379-382. ISSN 0004-637X. doi:10.1086/153068.

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New observations of the K i 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 Na i 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.

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Cohen, Judith G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1974 February 6; revised 1974 March 25.
Subject Keywords:abundances, nebular — interstellar matter — nebulae
Record Number:CaltechAUTHORS:20190529-161901928
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95897
Deposited By: George Porter
Deposited On:31 May 2019 15:24
Last Modified:16 Nov 2021 17:16

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