Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.601l&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The observations of deuterium imply that all D was formed in the big-bang and that the Galactic D (HST observations of the Lyman D yield a local ISM (D/H = 1.6 times 10^{-5}).results from infall of primordial gas plus destruction via astration. If D is produced via any stellar or galactic process, then it will be enhanced in active regions such as the Galactic center (GC) or in active galaxies. However a reduced D/H of 1.6 times 10^{-6} was detected in a GC molecular cloud (from DCN) and D (in DCN) has not been detected in the shocked molecular cloud associated with the IC 443 SNR, the protoplanetary nebula AFGL 2688, nor in the active galaxies NGC 253 and IC442 . These results are consistent with D/H in the less Galactic anticenter (D/H = 3.9 times 10^{-5} and D/H 1.5 times 10^{-5} in LMC molecular clouds. This is consistent with QSO absorption studies which yield D/H = (3.5-.2) times 10^{-5}. D has never been detected in stars or HII regions Thus all D is produced in the big-bang and destroyed in stars implying a density < than the critical density necessary to close the Universe and < 4 nu families.
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