Is deuterium of cosmological or of galactic origin

Details Is deuterium of cosmological or of galactic origin Is deuterium of cosmological or of galactic origin

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201l..51o&link_type=abstract

Astrophysical Journal, vol. 201, Oct. 15, 1975, pt. 2, p. L51-54.

Astronomy and Astrophysics

Astrophysics

25

Abundance, Cosmology, Deuterium, Galactic Evolution, Astronomical Models, Big Bang Cosmology, H Ii Regions, Line Spectra, Radiative Recombination

Scientific paper

If deuterium is made primarily in stars, then according to current models of galactic evolution it should have a higher abundance in the metal-rich parts of the Galaxy. If it is produced only in the initial big bang, then astration causes a decrease in D abundance with increasing metal abundance z. Since the sign of the galactic metal abundance gradient is known to be negative, it is proposed that a determination of the sign of the deuterium abundance gradient would indicate the probable origin of this isotope. In particular it appears possible that the ratio of the radio recombination line strengths (D/H) from dense H II regions might be measurable with realizable equipment and determine, relatively unambiguously, the ratio of abundances in various parts of the Galaxy.

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