Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..157h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 157-160.
Astronomy and Astrophysics
Astrophysics
46
Abundance, Correlation Coefficients, Gas Density, Interstellar Gas, Chlorine, Depletion, Deuterium, Hydrogen, Space Density
Scientific paper
The dependence of interstellar element depletion on line-of-sight mean hydrogen space density n(H) is investigated for 14 elements using mainly published gas-phase abundances. For six elements the correlation with n(H) is clearly stronger than with column density, N(H), whereas for Zn, O, N, and D there is virtually no correlation with n(H). The results clearly demonstrate that depletion is mainly governed by density-dependent processes, emphasize that n(H) is a more useful sight-line parameter than N(H), and suggest that significant depletion occurs in relatively low density gas as well as in dense clouds. In addition, it is shown that chlorine, which is volatile and was previously thought undepleted, can in fact be depleted by a factor 5 or more. No evidence is found for any significant depletion of interstellar deuterium.
Bromage Gordon E.
Gry Cecile
Harris Alan W.
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