Deuterium Abundance in the Local ISM and Possible Spatial Variations

Details Deuterium Abundance in the Local ISM and Possible Spatial Variations Deuterium Abundance in the Local ISM and Possible Spatial Variations

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84..285l&link_type=abstract

Space Science Reviews, vol. 84, p. 285

Physics

99

Deuterium, Interstellar Matter, Lyman Alpha Radiation, Interstellar Gas, Systematic Errors, Far Uv Spectroscopic Explorer, Hydrogen, Molecular Clouds

Scientific paper

Excellent HST/GHRS spectra of interstellar hydrogen and deuterium Lyman-(alpha) absorption toward nearby stars allow us to identify systematic errors that have plagued earlier work and to measure accurate values of the D/H ratio in local interstellar gas. Analysis of 12 sightlines through the Local Interstellar Cloud leads to a mean value of D/H = (1.50 +/- 0.10) x 10-5 with all data points lying within +/- l(delta) of the mean. Whether or not the D/H ratio has different values elsewhere in the Galaxy and beyond is a very important open question that will be one of the major objectives of the Far Ultraviolet Spectroscopic Explorer (FUSE) mission.

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