Physics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10510239s&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A5, p. 10239-10248
Physics
20
Interplanetary Physics: Interplanetary Dust, Interplanetary Physics: Interstellar Gas, Planetology: Solar System Objects: Dust, Planetology: Solar System Objects: Extraterrestrial Materials
Scientific paper
The composition of interstellar dust is normally inferred indirectly, from analyses of gas-phase abundances and an assumed total interstellar medium composition, providing data on the depletions of elements from the gas. Additional information comes from infrared observations of solid-state absorption bands (usually applicable only to dense clouds), from X-ray absorption and scattering measurements, and from the analysis of components of interplanetary dust particles. This review is focused on issues related to interstellar gas-phase abundances and depletions, and the question of appropriate reference abundance standards. The paper includes an overview of gas-phase abundance measurements, a summary of depletions as derived from the adoption of solar or stellar reference abundances, comments on the impact of depletion measures on the inferred dust composition, and a discussion of alternatives to the adoption of solar or stellar reference abundances. The paper concludes with a description of new instruments, soon to be in operation, that should help to resolve some of the issues.
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