Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..605y&link_type=abstract
Astrophysical Journal v.485, p.605
Astronomy and Astrophysics
Astronomy
20
Galaxy: Formation, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Population Ii, Stars: Subdwarfs
Scientific paper
Simple models for cosmic-ray--induced chemical evolution of the Galaxy prior to 1992 predicted a quadratic dependence of the Be and B abundances on metallicity among halo stars, whereas observations have shown that a linear trend obtains. Among the many possible solutions suggested so far for this apparent discrepancy, we have reexamined (1) the spallation by heavy cosmic rays impinging on protons and alphas in the interstellar medium and (2) the specific manner of evolution of the cosmic-ray energy spectrum during the collapse of the halo. We find that these solutions, which account equally well for the linear trend, give rise to different evolutionary behaviors of the lithium isotope 6Li as a function of metallicity. Precise measurements of 6Li in halo stars might enable one to overcome such a degeneracy in the solutions and provide new insight into the early energetic processes in the Galaxy.
Kajino Toshitaka
Ryan Sean G.
Yoshii Yuzuru
No associations
LandOfFree
Evolution of the Light Elements and the Cosmic-Ray Flux in the Galaxy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolution of the Light Elements and the Cosmic-Ray Flux in the Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of the Light Elements and the Cosmic-Ray Flux in the Galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1878219