Lithium abundance at the formation of the Galaxy

Details Lithium abundance at the formation of the Galaxy Lithium abundance at the formation of the Galaxy

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..483s&link_type=abstract

Nature, vol. 297, June 10, 1982, p. 483-485.

Computer Science

117

Abundance, Dwarf Stars, Galactic Evolution, Lithium Isotopes, Milky Way Galaxy, Big Bang Cosmology, Deuterium, Supernovae

Scientific paper

Population II dwarfs were observed for lithium abundance comparisons with young population I dwarfs to examine pregalactic abundance levels. Lithium lines were detected in a number of halo dwarfs and were identified as Li-7 displaying a 23-50 mA spectrum. The abundances were uniform for all the old dwarfs, 1/10 that of population I dwarfs. The origin of the Li-7 is discussed, along with depletion mechanisms such as mass loss and destruction in supernovae. It is concluded that the population II dwarfs have an abundance representative of the pregalactic abundance, 5.2/10 billion. This implies a low baryonic density for the universe, even considering errors in the abundance calculations. The conformity with deuterium ratios is further supported for the Big Bang theory, as well as arguments for an open universe.

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