Bibcode
Molaro, P.; Beckman, J.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 394-400. Research supported by the Osservatorio Astronomico di Trieste.
Advertised on:
10
1984
Citations
33
Refereed citations
27
Description
A high resolution spectrum (Δλ = 0.2 Å) of the
Population II star HD 76932 from the archive of the IUE satellite has
been analysed in a search for measurable resonance absorption lines due
to 9Be. Matching the observations by a synthesized model of
the wavelength region around the doublet at 3130 Å gives a
conservative upper limit for the abundance 9Be/H in the star
of 3×10-12. When all alternatives for the production
modes of 9Be and 7Li have been considered, this
result strongly supports a primordial origin for 7Li. The
primordial 7Li is the best method now available for
estimation of the universal baryon/photon ratio η; the range of
η derived appears to set a severe constraint on the number of
two-component neutrino types permitted within the context of standard
Big Bang model.