Generation of europium in metal-poor halo stars

Details Generation of europium in metal-poor halo stars Generation of europium in metal-poor halo stars

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49..251d&link_type=abstract

Acta Astronomica Sinica, vol. 49, no. 3, p. 251-259

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2

Physical Data And Process: Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Evolution, Supernovae: General

Scientific paper

r-process are thought to take place in neutron-rich Type II supernovae, but their sites are not exactly known. Recently some extremely metal-poor halo stars are found. They have two significant characters. One is that their r-process elements are over-abundant and are in excellent agreement with the scaled solar r-process curve. The other is that there have large dispersion of r-process elements with the same metallicity. A simulation on the chemical evolution of the Galaxy and the r-process distribution was made, considering both the star formation of interstellar gas itself and the star formation triggered by the nearby supernovae explosion. Comparing with the observation, the simulation shows that the low-mass Type II supernovae should be the possible r-process sites, and the supernovae are not response for all the inhomogeneity. In the future, the study on the inhomogeneity of the Galactic chemical evolution and the new observation of halo stars will give more understanding of this problem.

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