Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars

Details Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1016..421n&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: The 10th International Symposium on Origin of Matter and Evolution of Galaxies: From

Physics

Stellar Clusters And Associations, Origin, Formation, And Abundances Of The Elements, General, Solar Nebula, Cosmogony

Scientific paper

The evolution of extremely metal-poor (EMP) stars of low-/intermediate-masses is distinct from those of metal-rich stars in that the convection driven by the helium shell flash can extend outward into the hydrogen-rich layer during TP-AGB phase. In the circumstance of [Fe/H]<-2.5, protons are mixed and converted into neutrons in the convective zone to promote nucleosynthesis through neutron and α-captures. We study the nucleosynthesis in the helium-flash convective zone, induced by this hydrogen mixing. In the dearth of the pristine metals, the neutron-recycling reactions, 12C(n,γ)13C(α,n)16O, and in some cases, the subsequent 16O(n,γ)17O(α,n)20Ne, play an important role and catalyze the syntheses of O through Mg and still heavier elements. In particular, it is demonstrated that such peculiar abundance patterns of light elements from C through Al and heavy elements of Sr as observed from the two most iron-deficient stars, HE0107-5240 and HE1327-2326, can well be reproduced in terms of the nucleosynthesis in the metal-free and EMP AGB stars. In addition, the lack of Na and Al enhancement for a carbon-rich giant HE0557-4840 can be interpreted as the absence of neutron-capture reactions because of the negligible amount of proton ingestion. Based on these results, we assign their origin to the Pop III stars, born out of the primordial gas. We also discuss about the surface pollution both via the mass transfer in the binary systems and via the accretion of interstellar gas.

Affiliated with

Also associated with

No associations

Rating

Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars 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 Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interpretation of Extremely Metal-Poor Stars as Candidates of First Generation Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1406399