Deuterium Abundance in the Local ISM and Possible Spatial Variations |
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Authors: | Linsky Jeffrey L |
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Institution: | (1) JILA, University of Colorado and NIST, Boulder, CO 80309-0440, USA |
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Abstract: | Excellent HST/GHRS spectra of interstellar hydrogen and deuterium Lyman- 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) × 10-5 with all data points lying within ± 1 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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Keywords: | LISM interstellar medium deuterium |
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