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. https://resolver.caltech.edu/CaltechAUTHORS:20190529-161901928
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Abstract
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.
Item Type: | Article | |||||||||
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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 | |||||||||
DOI: | 10.1086/153068 | |||||||||
Record Number: | CaltechAUTHORS:20190529-161901928 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190529-161901928 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 95897 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | George Porter | |||||||||
Deposited On: | 31 May 2019 15:24 | |||||||||
Last Modified: | 16 Nov 2021 17:16 |
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