Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..683h&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Physics
Scientific paper
Deuterium is thought to be produced during primordial nucleosynthesis and then destroyed by astration. It is thus a key element in cosmology. The present-epoch deuterium abundance can be measured in the interstellar medium but those measurements have shown dispersion, interpreted as the result of unexpected spatial variations or underestimation of systematic errors. Final resolution will have implications for our understanding of the physics of the interstellar medium, galactic chemical evolution, and Universe baryonic density. The FUSE mission (NASA/CNES/CSA) has brought significant progress on these issues. It now appears likely that D/H presents a single value in the Local Bubble, in the range (1.3 - 1.5) 10-5. However, the D/O, D/N, and D/H measured far beyond the Local Bubble suggest a canonical, present-epoch D/H in the range (0.5 - 1.0) 10-5. This is significantly lower than the local value, which was often assumed to be representative of the Galactic disk. These new lower values may challenge deuterium evolution models.
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