Other
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..296d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 296-301. NSERC-supported research.
Other
10
Abundance, Argon, Atomic Interactions, Interstellar Gas, Interstellar Matter, Molecular Clouds, Carbon, Depletion, Grain Size, Iron, Silicon, Stellar Mass Accretion
Scientific paper
It is shown that the depletion of Ar atoms in interstellar dust clouds is well correlated with the depletion of other heavy elements such as C, Si, Fe, and S. Since Ar sticks to dust but does not become incorporated in interstellar molecules, the rate of depletion of Ar can be used to infer the rate at which other heavy atoms collide with dust. Here, the rates of depletion of Ar and other elements are compared and the results are discussed. It is found that: (1) the net sticking efficiency of all elements is less than or equal to that of Ar; (2) Ar first accretes on cores of MgFeSi of oxide or silicate composition; and (3) carbon depletion in diffuse interstellar clouds is also due to accretion on MgFeSi-oxide or MgFeSi-silicate grains. The relative sticking probabilities of the different elements are given in a table.
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