Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.5704d&link_type=abstract
American Astronomical Society Meeting 205, #57.04; Bulletin of the American Astronomical Society, Vol. 36, p.1436
Other
1
Scientific paper
The D/H ratio in interstellar gas varies on scales of a few hundred pc in the local Milky Way, with D/H values ranging from ˜7 ppm to ˜22 ppm. The reduction in D/H relative to the primordial value of D/H ≈26 ppm is usually attributed to ``astration'' -- conversion of D into other elements by nuclear fusion in stars. However, it is shown here that astration has difficulty accounting for the observations because the expected associated variations in O/H are not seen.
The lower D/H values are instead likely due to ``depletion'' of the D onto dust grains. Polycyclic aromatic hydrocarbons (PAHs) are a possible repository for the missing D, and it appears possible for gas-grain reactions to achieve extreme deuteration of carbonaceous grain material. Grain destruction will release D from the grains; the gas phase abundance of D should therefore be positively correlated with the gas phase abundances of other elements that exhibit strong depletions, such as Mg, Si, Ti, and Fe, which also will be returned to the gas by grain destruction.
This work was supported in part by NSF grant AST-0406883.
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